For the beginning of every point, the server has two chances to get a serve in the correct service box. If on the first serve the ball is called a fault, then it is second serve. If on the second serve there is a let, then it is still the second serve, and the server may redo the serve.
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A foot fault occurs when the server steps into the court before hitting the ball. If the server jumps, hits the serve, and lands in the court, then it is acceptable, but if the foot is in the court, while the ball is being served, then it is a foot fault.
A foot fault is the same as a regular fault. If you foot-fault twice then its their point. Though it often occurs much more in junior tennis then the pros.
It's a service fault caused by the positioning of the foot. Specifically, it means you stepped over the line while serving.