'eXamine' is used, normally, for memory inspection. It permits you to view memory at a given location. Using different syntax for the command permits you to designate different sections and methods to view specified memory. You can specify memory location by literal address, offset, reference from variable, reference to memory reference within variable, reference within a register, etc.
I strongly recommend both in-depth research on the command(aka RTFM) as well as trial & error experimentation. Keep notes if you have to; they could come in handy later if you need to review.
