Why Do You Need a Time Derivative for a Wave Equation?

Time derivative, I was saying like no way you initial derivative like condition on the derivative. Also, wait, this is a big misunderstanding right here. You does not represent speed of the wave or position of the wave. You represent the amplitude. This is also important. And again, you just meaning different things in different contexts. So some things to look forward to or maybe not look forward to is the heat equation.