What actually are the DB9, DB25 ports available in our computers?

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answerhappygod
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What actually are the DB9, DB25 ports available in our computers?

Post by answerhappygod »

a) they are connectors used to transfer data either serially or parallelly
b) they are the RS232 connectors used to connect two incompatible devices
c) they are the TTL logic connector pins used for communication
d) they are just data transfer pins used to transfer the data
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