What is the difference between computer science and information technology?

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Computer Science is a “Hard” Science, well grounded in what is now known in the field of Mathematics as Information Theory. Computer Science (as a field) is concerned with developing new ideas around the use and design of computing systems, and with the mathematical concepts of computation and information.

Information Technology, on the other hand, is a practical Engineering discipline, concerned with implementing solutions to practical problems using current-day technology.