Market profile is a graphical organization of price and time information. Market profile displays price on the vertical axis and time on the horizontal axis. Letters are used to symbolize time brackets. Market profile is an analytical decision support tool for traders; it is not a trading system.
Market profile reveals pricing patterns from any market as they develop. By effectively organizing price and time information, it is possible for traders to see which price areas the market is accepting or which ones it is rejecting, and adjust their trading styles accordingly.
Video: Using Market Profile
Advanced Topic: Market Profile Handbook