This is the pic for the task.

So in the movie, AI (artificial intelligence)) is discovered, and robots have it. But they advanced so far that they use humans as batteries, kerping them in pods and having them live in VR (virtual reality) called the matrix, a perfect virtual life, while the machines drain their energy. And then there are these people who are aware that it is not real life, but can't quite describe it. Morpheus, the leader of those people pictured above AKA greek god of dreams, when recruits new people (including Neo) he gives them two options. Take the red or the blue pill and says the following:

And then Neo decides to take the red pill, and blah blah watch the movie if you want to know more. This is a great event in the movie and makes you question what real life truly is.