determining speed using window xp

hello, As i am searching options for a new/gently used lapop, what is the
term used for processor speed . I have a 2 yr old laptop running home XP. My
laptop has only 512 ram and 80 GB HD...Now I am looking for another laptop
for a fam member who will need plenty of memory for graphics/photos/ etc
sometime in the near future. Can you define briefly processor speed and what
it does? plus HD and Ram. . Is the GHZ number the one that determines how
fast the unit functions? simple explanations are greatly appreciated. thank
you in advance.



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