In Hold'em, the important features are "position, position, position" (like the real estate maxim "location, location, location").
Your seat at the table (your position) is so important that some two-cards can't be profitably played from an early position. These same cards are ones that you would likely raise with from a late position.
In a typical ten-handed game, PokerSchool Online refers to the positions as:
The expression "passing the buck" does not refer to dollar bills, but to poker. And President Harry S. Truman, an avid poker player himself, had a sign on his desk in the White House that read, "The Buck Stops Here."
--Reprinted with permission, from "Poker for Dummies", by Richard D. Harroch and Lou Krieger, IDG Books Worldwide, Inc. ©2000