A wave with nodes, points that do not move. Created by two waves of equal magnitude and frequency but opposite directions.

You can create a standing wave with a rope by keeping one end fixed and moving the other end up and down. You create a wave moving away from you and it reflects back from the fixed end, creating two waves of equal magnitude and direction but opposite directions. Each end of the rope is a node. If you double the frequency that you move the rope you will create a new node in the middle of the rope.