The s orbital is a type of atomic orbital that can hold a maximum of two electrons. It is spherical in shape and is the simplest of all orbitals. The s orbital is found in every energy level of an atom, starting from the first level, where it is the only orbital present. In the context of the quantum mechanical model of the atom, the s orbital is described by a set of quantum numbers. The principal quantum number (n) indicates the energy level, while the angular momentum quantum number (l) is always zero for s orbitals. This means that s orbitals have no angular nodes, making them symmetrical around the nucleus.