Access is Microsoft's database program, not a permission you grant
Access is a database program made by Microsoft — it stores and organizes information in tables, similar to how a spreadsheet stores data in rows and columns. But Access is built specifically for managing large amounts of related information across multiple tables, with built-in tools to search, filter, and report on that data without needing to manually sort through everything.
You may hear the word "access" used two different ways in tech. One is this program: Microsoft Access. The other is a permission — like when someone says "I don't have access to that folder" meaning they lack permission to open it. This guide covers the program itself.
Access is most common in small to medium-sized businesses, nonprofits, and government offices where people need to track inventory, manage client records, or log financial transactions. It is less common in home use because most people store their information in spreadsheets, cloud storage, or specialized apps instead.
Key Takeaways
- Access is a database program that organizes information in related tables, not a permission or a cloud storage service.
- Access files end in .accdb (or .mdb in older versions) and require the Access program installed on your computer to open and edit.
- You can view Access files without owning the program by using the free Access Runtime or by converting the file to another format, but editing requires the full program.
- Access is different from Excel because it handles relationships between data across multiple tables, while Excel is better for straightforward lists and calculations.
How Access stores information differently than Excel
An Excel spreadsheet is one flat sheet where you list information in rows and columns. If you track customers and their orders, you might put the customer name in one column and the order details in the next column on the same sheet. If a customer has ten orders, you type their name ten times.
Access uses separate tables that connect to each other. You create one table for customers (name, address, phone) and another table for orders (order date, amount, customer ID). The two tables link through the customer ID, so you only type the customer's information once. When you need to see all orders for one customer, Access pulls that information from both tables automatically.
This matters because it saves space, reduces errors (you cannot accidentally type a customer's name two different ways), and makes it faster to find and update information. For a small business tracking a few dozen customers, Excel works fine. For tracking thousands of records across multiple categories, Access is more efficient.
What file types Access creates and how to open them
Access files have two main extensions depending on when they were created. Files ending in .accdb are the current format used by Access 2007 and newer. Files ending in .mdb are older, created by Access 2003 and earlier. Both contain the same type of database — the newer format is just more find and efficient.
To open and edit an Access file, you need Microsoft Access installed on your computer. It comes as part of Microsoft 365 (the subscription version) or as a standalone purchase. If you only need to view the data without editing it, you can use the free Access Runtime, which Microsoft provides specifically for this purpose — it lets you open and read Access files but not change them.
If someone sends you an Access file and you do not have the program, you have a few options: ask them to convert it to an Excel file (which loses the table relationships but preserves the data), use the free Runtime to view it, or install a trial version of Access to see what you are working with.
When you might encounter an Access file at work or in your community
Small nonprofits often use Access to track donors, volunteers, and program participants because it is cheaper than specialized donor management software. Medical offices use it to organize patient records and appointment histories. Local government offices use it for permit tracking, license records, or property information. Schools sometimes use it to manage student grades and attendance across multiple classrooms.
If your workplace uses Access, you might receive a file to enter data into, or you might need to run a report that someone else built in Access. You do not need to understand how the database is designed — you just need to know how to enter information into the forms or tables you are given, and how to export the results if you need to share them.
Home users rarely encounter Access unless they are managing a hobby collection (like a book library or recipe database) or they work from home and use their employer's database. Most personal information storage happens in cloud services like Google Drive, OneDrive, or specialized apps instead.
Access versus other ways to store information
Access is one tool among several for organizing data. Here is how it compares to what you might use instead:
| Tool | Best for | Requires installation |
|---|---|---|
| Excel | straightforward lists, calculations, budgets, small datasets | Yes, but widely available |
| Access | Large datasets with relationships, tracking across categories | Yes, less common |
| Google Sheets | Collaboration, straightforward lists, cloud storage | No — works in a web browser |
| Specialized apps | Specific tasks like invoicing, inventory, or donor tracking | Varies |
Access is less common now than it was ten years ago because cloud-based tools and specialized software have taken over many of its uses. But organizations that built their systems in Access years ago often keep using it because the data is already there and the system works.
What you need to know if someone asks you to use an Access file
If your employer or an organization gives you an Access file to work with, you will usually interact with it through a form rather than the raw tables. A form is a screen designed to make data entry easier — it looks like a paper form with boxes to fill in, and Access handles putting that information into the right tables behind the scenes.
You do not need to understand the database structure to use it. You just need to know: where to type information, what information goes in each box, and how to save your work (usually by closing the form or clicking a Save button). If you need to pull information out, you might run a report that someone else created, or you might export the data to Excel.
If you receive an Access file and do not have the program installed, tell the person who sent it to you. They can either install the free Runtime on your computer, convert the file to Excel, or give you a different way to access the information.
Frequently Asked Questions
Can I open an Access file on a Mac?
Access is primarily a Windows program. Microsoft does not make Access for Mac. If you have a Mac and need to work with an Access file, you can use the free Runtime if someone has set it up for you, or ask the file owner to convert it to Excel or another format you can open on your Mac.
What is the difference between .accdb and .mdb files?
.mdb files are the older format from Access 2003 and earlier. .accdb files are the newer format from Access 2007 onward and have better security and performance. Both contain the same type of database. If you have an old .mdb file, you can open it in newer versions of Access, and Access will offer to convert it to .accdb.
Do I need to buy Microsoft Access to view an Access file?
No. You can use the free Access Runtime to view and use Access files without buying the program. The Runtime lets you open files and enter data into forms, but you cannot edit the database structure or create new tables. If you need to make changes to how the database is organized, you need the full Access program.
Is Access the same as OneDrive or SharePoint?
No. OneDrive and SharePoint are cloud storage services where you store files online. Access is a program that creates database files. You can store an Access file in OneDrive or SharePoint so multiple people can access it, but that does not change what Access is — it is still a database program, not a storage service.
Why would someone use Access instead of just a spreadsheet?
Access is better when you have large amounts of related information. If you track customers, orders, and payments, Access lets you store each type of information once and connect them together. A spreadsheet would require you to repeat customer information on every order row, which wastes space and makes updates harder. For straightforward lists or calculations, a spreadsheet is faster and easier.