What part of a wave is described as the highest point?

The highest point of a wave is referred to as the crest. This terminology is fundamental in wave physics, where waves are characterized by their repeating patterns. The crest represents the maximum displacement of points on the wave from its rest position, illustrating the peak height the wave reaches during its oscillation.

In contrast, the trough is the lowest point of the wave, representing the minimum displacement from the rest position. Wavelength defines the distance between two consecutive crests or troughs, while wave base refers to the depth in a medium, such as water, at which the energy of the wave diminishes significantly. Thus, while these terms are all related to wave dynamics, the crest specifically indicates the point of maximum height, making it the correct answer.