Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids.
It has to do with figuring out how the atoms in crystalline solids are arranged and bound, as well as the geometric layout of crystal lattices.
A basic concept in crystal structures is the unit cell.
It is the smallest unit of volume that permits identical cells to be stacked together to fill all space.
By repeating the pattern of the unit cell over and over in all directions, the entire crystal lattice can be constructed.
Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids.
Crystallography is a fundamental subject in the fields of materials science and solid-state physics (condensed matter physics).