It's not really that hard to understand , the bot simply makes thing automatic without the need of you doing anything.
well, yeah but it is not all bots do.
one of the most important things a bot is supposed to do is analysis, although when we are talking about a trading bot there are lots of them and each of them are different, with different features. but they are supposed to have these things. for example you give it the charts and it draws the line and helps you in the analysis.