An AND gate is a logic gate performing a Boolean logic AND
operation.
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universal logic gate is a gate using which you can make all the
logic gates
there are two such gates NOR gate and NAND gate
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An XNOR gate is a logic gate performing a Boolean logic XNOR
operation, also known as an equivalence gate.
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When the two input terminals of a NAND gate are short circuited,
it acts as a NOT gate.
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The switching time (on and off) of the TTL logic gate is very
fast in comparison with CMOS logic gate. However, they could not
tolerate higher range of power supply.