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If we talk of both technically:
CS takes a more balanced approach between theory and application while IT focuses more on application. CS offers you an opportunity to learn variety of topics related to computers. IT offers you an opportunity to discovers innovative uses of those fundamental concepts. CS generally require a decent background in math while use of math in IT is limited to data analysis / processing / statistics, etc. You may call IT as one of the sub-divisions of CS however there are certain things that are unique to IT like integrated programming, system administrations, maintenance, etc. While these differences exist on paper, in India the line of difference between IT and CS courses is very blurry. Here are the similarities :
None of them involves hardwares. You may have to take one or two courses on digital systems where you will study about ICs and logic gates. That's it. You won't learn how to repair computers in any of them. Most of the courses offered in both the branches are related to programming. You will have to programme on a daily basis in both the branches.