Computer science is the field of writing code and scripts on the computer to instruct it to perform certain tasks.

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Originally Posted by Echofon

Computer science is the field of writing code and scripts on the computer to instruct it to perform certain tasks.

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While this is true, you're missing the big picture.

The core of computer science is really the study of algorithms, and an algorithm is a series of steps needed to solve a problem. An algorithm can be actual code, or it can be a theory or a generic statement.

I would simply say; computer science is; study of computer, how computer hardware and software works, interact with each other.