So orbitals represent certain shapes or volumes within which our electrons are most likely in. The reason I say most likely is because orbitals are probabilities. Now, before we talk more about orbitals, let's recall what quantum numbers are. Quantum numbers are simply the idea of our electrons. So if we have a unique electron in a given atom, that electron has four unique quantum numbers that are unique to that electron. So we have the principal quantum number, we have the Zimmerfo quantum number, and we have two more quantum numbers.