what is an adapter?

Hi ,
Hi what is an adapter?what is its use ?
How to log into a tibco server from unix home directory.

I think your query needs to be more specific...

An adapter is a physical device that allows one hardware or electronic interface to be adapted (accommodated without loss of function) to another hardware or electronic interface. In a computer, an adapter is often built into a card that can be inserted into a slot on the computer's motherboard.