The Terminator is a series of movies starring Arnold Schwarzenegger, about machines that travel back through time in order to try to assassinate the future leader of human resistance. There are 4 movies in the series so far, as well as a TV series.
The canonicity of the franchise is rather confusing, with the TV series being canon to the first two movies but not the third, and the third movie being canon to the first two movies but not the TV series.
Power of the Verse
The Terminator universe is considered to be very strong, due to liberal use of nukes, time travel (although limited), and the durability, strength, and abilities of the various Terminators.