basic information about gates:
A logic gate is an idealized or physical device implementing a Boolean function, that is, it performs a logical operation on one or more logic inputs and produces a single logic output. Depending on the context, the term may refer to an ideal logic gate, one that has for instance zero rise time and unlimited fan-out, or it may refer to a non-ideal physical device.
Logic gates are physical or symbolic devices used to represent Boolean functions. In Boolean algebra, one uses variables to represent the values TRUE and FALSE. Logic gates and Boolean functions perform operations on these variables.
The basic gates are: AND, OR, and NOT. Other gates such as XOR, NAND, NOR and XNOR can be expressed in terms of these three.
The basic gates are: AND, OR, and NOT. Other gates such as XOR, NAND, NOR and XNOR can be expressed in terms of these three.