How to create a bot that will check a certain area of ​​the screen?

Question

Bots

There is a task in which the bot will read a certain area of ​​the screen (or rather, a certain window), and check whether it matches the prepared screen of this area. If not, then it will perform some action, otherwise it will wait for the area to change. How can this be done, and in what language? Can you suggest any guides, articles or something like that?