Chess Programs - How is it used here
Is it true? Are people really plugging in programs to play one another? How? Explain.

It is against site rules to use engines in games.
https://support.chess.com/customer/en/portal/articles/1444879-fair-play-on-chess-com-what-you-need-to-know
Also, discussions on the issue should be in the following group and not in the general forums.
https://www.chess.com/groups/home/cheating-forum