There are a few ways to find out which build and version of Windows 10 you are using. Here are three methods:

1. Use the Settings app.

1. Open the Settings app by pressing Windows+I on your keyboard.
2. Click on System.
3. Click on About.
4. Scroll down to the Windows specifications section.
5. The Version and Build numbers will be listed here.

2. Use the Winver command.

1. Press Windows+R on your keyboard.
2. Type winver and press Enter.
3. The About Windows dialog box will open.
4. The Version and Build numbers will be listed here.

3. Use the Systeminfo command.

1. Open a command prompt.
2. Type systeminfo and press Enter.
3. The Systeminfo output will be displayed.
4. The OS Version and Build Number will be listed here.

Which method should I use?

The easiest method to use is the Settings app. However, if you are having trouble accessing the Settings app, you can use the Winver command or the Systeminfo command.

What do the Version and Build numbers mean?

The Version number is a four-digit number that represents the major version of Windows 10. For example, the version number for Windows 10 21H2 is 10.0.22000.1.

The Build number is a six-digit number that represents the minor version of Windows 10. For example, the build number for Windows 10 21H2 is 19044.1611.

The Version and Build numbers are used to identify the specific version of Windows 10 that you are running. These numbers can be useful for troubleshooting problems or for finding compatibility information for software.