Foot Fault
Touching the end line, or the court past it, before you contact the serve. You also have to be inside the service zone, the area behind the end line between the two sidelines extended. If you jump from behind the line, your body can be over the court in the air when you hit. The fault is touching the floor too early. Jump servers run into this a lot because the approach pulls them forward.
Example
The server's toe is on the end line as she contacts the ball. The line judge flags it. The other team gets the point, the same as if the serve had gone into the net.
Frequently Asked Questions
What is a foot fault in volleyball?
You touched the end line, or the floor in the court, before you hit the serve. Stepping outside the sideline extensions of the service zone counts too. The other team gets the point and the serve.