In general electronics terms, a logic gate is an idealized or physical device implementing a Boolean function; that is, it performs a logical operation on one or more logical inputs, and produces a single logical output.
pls refer the url: http://en.wikipedia.org/wiki/Logic_gate
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@1234544446, assuming you are in a learning process. There is no shortcut to learn anything good. Have you asked your faculty about your question? What is their replies? Please read your study materials that provided by the institution and gather solid knowledge for your future career.