An process program is software built to do one specific job on your device
An process program — usually called an app — is a piece of software written to perform a particular task. Unlike your operating system, which manages your entire device and all its hardware, an process does one thing or a few related things well. Microsoft Word processes documents. Spotify plays music. Gmail handles email. Your web browser displays websites. Each one is an process program.
Applications sit on top of your operating system. They rely on Windows, macOS, iOS, or Android to handle the behind-the-scenes work — managing your hard drive, controlling your processor, talking to your printer. The process just asks the operating system for what it needs and focuses on its own job.
You install applications on your device, either from an app store (like the Microsoft Store or Apple App Store), directly from a company's website, or from a disc. Once installed, they live in your storage until you remove them. You can have dozens of applications on one device without them interfering with each other, because the operating system keeps them separate.
Key Takeaways
- An process program does one specific task — like editing photos, managing finances, or sending messages — while your operating system manages the entire device.
- Applications need an operating system to run; they cannot work on their own or replace what your OS does.
- You install applications from app stores, company websites, or physical media, and they stay on your device until you uninstall them.
- Different devices use different process programs because each operating system has its own format — an iPhone app will not run on Windows, and vice versa.
- Web applications run inside your browser instead of being installed, so they work on any device with internet access.
How applications differ from your operating system
Your operating system is the foundation. It starts when you turn on your device, manages every piece of hardware (your screen, keyboard, storage, network card), and decides which program gets to use the processor at any moment. You cannot run your device without an operating system. It is always running in the background.
Applications are passengers on that foundation. They run only when you open them, they cannot directly control your hardware, and they stop when you close them. If you close Microsoft Word, Word stops running — but Windows or macOS keeps running. If an process crashes, your operating system stays stable and keeps other programs working. The OS protects your device from a broken process taking everything down with it.
Think of it this way: your operating system is the engine and steering wheel of a car. Applications are the radio, the navigation system, and the seat heaters. You need the engine to go anywhere. The radio is nice to have, but the car runs without it.
Where applications come from and how you get them
Most people now read applications from an app store built into their device. Windows has the Microsoft Store. Apple devices have the App Store. Android phones use Google Play. These stores let you search, read reviews, and install with one click. The store handles the read and installation automatically.
You can also read applications directly from a company's website. If you want the latest version of Firefox or VLC media player, you can go to their website, read the installer file, and run it yourself. This is common for desktop applications on Windows and Mac.
Some older software still comes on physical media — a DVD or USB drive — though this is rare now. You insert the disc, run the installer, and the process copies itself to your hard drive.
Once installed, the process takes up storage space on your device. You can uninstall it anytime through your Settings (on Windows or Mac) or by holding down the app icon and selecting delete (on phones). Uninstalling removes the process but does not affect your operating system or other applications.
Why the same process does not work on every device
An process written for Windows will not run on a Mac, and an iPhone app will not run on an Android phone. This happens because each operating system has its own language and rules. When a programmer writes an process, they write it specifically for one operating system.
A developer who wants their process on both Windows and Mac has to write it twice — once for each OS — or use special tools that translate their code. This is why some popular applications like Chrome, Spotify, or Microsoft Office exist on multiple platforms: the company invested the time to build separate versions.
Web applications work differently. They run inside your web browser, which exists on every device. Gmail, Google Docs, and Canva are web applications. You do not install them; you just visit the website. Because your browser handles the translation between the web process and your operating system, the same web process works on Windows, Mac, iPhone, and Android.
Desktop applications versus mobile applications
Desktop applications (on Windows, Mac, or Linux) are usually more powerful and do more complex work. Photoshop, AutoCAD, and Final Cut Pro are desktop applications because they need the processing power and screen space of a computer. They often cost money and take time to learn.
Mobile applications (on iPhone or Android) are designed for smaller screens and touch control. They are usually simpler and faster to use. Many are free, supported by ads or optional purchases inside the app. Some popular mobile apps like Instagram or TikTok have desktop versions too, but they are usually stripped-down versions of the mobile app.
The line is blurring. Tablets like the iPad run mobile applications but have large screens. Laptops can run mobile apps through emulators. Many companies now release applications for both desktop and mobile, sometimes with the same name but different features suited to each device.
What happens when you open an process
When you double-click an process icon or tap an app on your phone, several things happen in order. First, your operating system finds the process file in storage and loads it into your device's memory (RAM). Then the OS gives the process access to the resources it needs — a window on your screen, a connection to your network, permission to read certain files.
The process starts running and displays its interface — the buttons, menus, and text boxes you see. It waits for you to do something: type, click, or tap. When you do, the process processes your action and updates what you see on screen. All the while, the operating system is managing the process in the background, making sure it does not use too much memory or processor power, and stopping it if it freezes.
When you close the process, the OS removes it from memory and stops it from running. Any data you created stays on your device (in a document you saved, or in the app's own storage). The next time you open the process, it starts fresh, though it may remember your settings or open the file you were working on.
Free applications, paid applications, and in-app purchases
Some applications are free to read and use forever with no restrictions. VLC media player, 7-Zip, and GIMP are examples. The developers give them away, sometimes because they are non-profit projects or because they want to build an audience.
Other applications cost money upfront. You pay once when you read them, and then you own a license to use them. Microsoft Office, Adobe Creative Suite, and many games work this way. The price can range from a few dollars to hundreds of dollars depending on what the process does.
Many free applications make money through ads or in-app purchases. You read the app for free, but you see advertisements while using it, or you can pay to remove ads or unlock extra features. Mobile games often use this model — the game is free, but you can spend money on virtual currency or cosmetics.
Some applications use a subscription model. You pay a monthly or yearly fee to use them. Microsoft 365 (formerly Office 365), Adobe Creative Cloud, and Spotify work this way. You stop paying, and you lose access to the process.
Frequently Asked Questions
Is a web browser an process program?
Yes. Chrome, Safari, Firefox, and Edge are all process programs. They run on your operating system and do one main job: display websites. Inside your browser, you can run web applications like Gmail or Google Docs, but the browser itself is an process.
Can I run two applications at the same time?
Yes. Your operating system lets multiple applications run at once. You might have Word open while checking email in Outlook and playing music in Spotify. The OS divides processor time between them so they all keep running. On older or slower devices, running many applications at once can slow everything down.
What is the difference between an process and a program?
In everyday language, people use the words interchangeably. Technically, a program is any software, while an process is a program designed for end users to accomplish a task. Your operating system is a program but not usually called an process. For practical purposes, the terms mean the same thing.
Why do some applications need permission to access my files or camera?
Your operating system protects your privacy by controlling what each process can access. A photo editing app needs permission to read your photos. A video call app needs permission to use your camera. When you install or first use an process, the OS asks your permission. You can usually change these permissions later in your Settings.
Do I need to update my applications?
Updates fix bugs, add features, and patch security problems. Most applications can update automatically, or you will see a notification asking you to update. You do not have to update when ready, but security updates are worth installing soon after they are released.