History of ComputerScience

* Data structures (how to store stuff so it's small/easily accessible/useful for something)

* Algorithms (how to do stuff fast)

* Operating systems (how to do lots of stuff at once)

* Graphics (how to generate/process pretty pictures)

* Networking (how to communicate with other stuff)

* Architecture (how to build stuff that does stuff, and hopefully does it fast)

Though lately, more and more things are happening with machine learning and artificial intelligence.