I read that: The electron (according to de broglie) can be described by a summation of many different waves according to

PSI(X,t)= integration (A e^i(kx-wt))

Does each wave correspond to a certain orbital? and if each of them is for an orbital, why the electron is described by their summation? I expected that for each orbital there will be only one wave (not a summation)

Thank you for your help