The film depicts a dystopian future in which humanity is unknowingly trapped inside a simulated reality, the Matrix, created by thought-capable machines to distract humans while using their bodies as an energy source. When computer programmer Thomas Anderson, under the hacker alias "Neo", uncovers the truth, he "is drawn into a rebellion against the machines" along with other people who have been freed from the Matrix.

References:
https://en.wikipedia.org/wiki/The_Matrix