Integrated python debugging - what is it?

I came across a list of Python editors and a list of features here: What IDE to use for Python?

Among those features were "Integrated Python Debugging". As I'm trying to decide on a text editor to use, I thought I'd look it up, because I don't know what debugging is more than "fixing bugs". That left me none the wiser however, so now I'm asking: as a beginner with Python, how will having this feature in a text editor affect me?