What do the focusIn and focusOut event types mean?

Question

I am reading a book on Tkinter and so far making good progress understanding the concepts for a gui I want to make. One thing unexplained in the book is the concept of focusIn and focusOut. I have looked at the tcl.tk explanation and cannot understand what the events mean from that either.

If this is not the correct place to post such a question I apologise but I don't know where else to ask.

Answer 1

The focusIn event occurs when you select a widget so that your keyboard input goes to that widget. For instance, when you click on an input field so you can type into it.

The focusOut event occurs when you leave the widget that previously had focus, by moving keyboard focus to some other widget.