What is a crystal lattice? How is it formed?

(N/A) crystal lattice is a regular,repeating three-dimensional arrangement of points in space. Each point represents a constituent particle (atom,molecule,or ion).
It is formed by the regular,periodic,and translational repetition of a structural unit called the unit cell in three dimensions.
The unit cell is the smallest repeating structural unit of a crystal lattice that,when repeated in all directions,generates the entire crystal structure. The figure illustrates how a unit cell,by translational displacement,builds up a two-dimensional lattice.