Wave vector

Ok kiddo, let's talk about wave vector! Imagine you are at a beach and you see waves in the water. The waves in the water are like waves of light or sound that you might hear or see. Wave vector tells us which direction the waves are moving in and how their wavelength (the distance between two of the little peaks or troughs in the wave) and frequency (how often the wave moves up and down) are related to each other. This might not seem super important, but it helps us understand how waves move and why they behave the way they do. Kind of cool, huh?