Crystal Lattice..
A crystalline solid consists of three dimensional pattern that repeat itself over and over again...
In other words ..
The whole structure obtained by the repetition of unit cell known as crystlattice.
The smallest three dimensional basic structures is called unit cell.The crystal lattice is formed by repetition of unit cell.
E.g NaCl has cubic shape .cubic crystal hve al the sides meet at right angle
Other crystal shapes have corners in which one or more ofthe angles are not right angles.