Xbox Series X|S and Xbox One consoles feature updatable software, including the operating system (OS) as well as many games, and media apps. Occasionally, the system software updates may also update the system's firmware.

System updates help improve your experience with the addition of new features as well as improving existing features.
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How do I update my Xbox system?

These are official Microsoft steps for updating your Xbox Console
 
Automatically update your Xbox:

By default, your console is set to receive updates automatically. In this mode, each night, your console checks whether any updates are available, and then it downloads and installs the updates when the console isn't being used. This reduces the impact updates have on your Xbox experience, and they won't block you from connecting to the Xbox network unless they become mandatory.

To make sure your console is set to update automatically:
  1. Press the Xbox button to open the guide.
  2. Select Profile & system>Settings>System>Updates
  3. Under Updates, select Keep my console up to date to update your console automatically and Keep my games & apps up to date to update games and apps automatically
Manually update your Xbox:
  1. Make sure that your console is connected to the internet, and then press the Xbox button to open the guide.
  2. Select Profile & system>Settings>System>Updates
  3. Under Updates, you'll see:
    • Console update available. Select this to begin your update, or
    • No console update available. This means your console is up to date.