The differences and common points between propagative and standing waves are represented in the figure below. Three waves are displayed in the figure.
The first one, at the top, represents a wave propagating from left to right.
The second one, in the middle, represents a wave propagating from right to left.
The third one, at the bottom, represents the addition of the two previous propagating waves, point to point and time to time. Note that the zeros and extrema of this last waves stand at fixed positions contrary to the previous propagating waves. The last wave is an example of a standing wave.