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A half adder has less components, and may therefore be cheaper. So, in cases where all you need is a half adder, it may be more convenient to use a half adder. Or it may be more convenient to mass-produce only the full adders, since a full adder can work as a half-adder as well.Also, in introductory electronics textbooks, the half-adder would be introduced first, just because it is simpler.

Full adder is better than half adder because in half adder we can perform operation on only two digits and in full adder we can perform operation on three binary digits.

Yes, the Adder is an endangered species. Yes, the Adder is an endangered species.

1.serial adder add bits serially but parallel adder add bits at the same time .

2.serial adder depends on previous outputs but parallel adder does not depends on previous outputs .

3.parallel adder takes less time to execute compared to serial adder.