0
Not necessarily. A not gate may or may not be an or gate, but an or gate must not be a not gate.
the not gate applied to and gate is nand gate
A nand gate can be made from an and gate by introducing an inverter at the output of the gate.
An OR gate is a digital logic gate.
If one or both of the inputs to the gate are "1", then the ouput of the gate will be "1" .
If both of the inputs to the gate are "0" then the output of the gate will be "0".
NOT Gate