To know if you have Windows 10 or Windows 11, follow these steps:

1. Click the Start icon on your taskbar and select Settings.
2. In Settings, select System, then scroll down and select About.
3. Under Windows specifications, check the Edition and Version. It will clearly state if your system is running Windows 10 or Windows 11.

Alternatively, press Win + R to open the Run dialog, type "winver" and hit Enter. A window will pop up showing the exact Windows version you are using. These are the simplest and surest ways to identify your Windows version.