Question

Difference between unit cell and primitive cell

Answer 1

Primitive unit cells contain only one lattice point, which is made up from the lattice points at each of the corners. Non-primitive unit cells contain additional lattice points, either on a face of the unit cell or within the unit cell, and so have more than one lattice point per unit cell

https://www.doitpoms.ac.uk/tlplib/crystallography3/unit_cell.php