IT refers to Information Technology. CS refers to Computer Science. IT is an applied technical discipline concerned with using available technologies to manipulate data for organizational operations. In its pure form, CS is a theoretical field concerned with using computational tools to solve problems on top of a mathematical foundation.
Of course there is a vague line between certain branches of applied computer science and theoretical information technology where the terms become nebulous. Wikipedia has decent definitions of both if you're so interested.
(Maybe I misunderstood your point)