Orbitals are regions around the nucleus of an atom where electrons are most likely to be found. They come in different shapes and energy levels.
Sublevels: These are divisions within principal energy levels that contain one or more orbitals. Like different sections within a dog park.
Quantum Numbers: These numbers describe properties of atomic orbitals and their electron occupants; they're like ID tags for dogs at each park.
A principle stating that no two electrons can occupy the same quantum state simultaneously; it's like saying no two dogs can have the same ID tag.