Welcome to ITKE, ravivashistha! If you mean ‘docking station’, here’s a great definition from WhatIs.com.
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Hi, and welcome to ITKE. This took me about 2 seconds to look up on Google, and like Michael, I found the same article on Whatis.com which would answer your homework question for you.
In addition to docking station, “dock” can also refer to a fixed placement of a movable window or panel in relation to other windows or panels. Without some context, there’s no way to know which meaning is relevant. — Tom
or Documentation … probably not all caps.