What are the main differences between crystallization and evaporation?

Answer 1

Crystallisation depends on a solvent cooling, and takes advantage of different solubilities at different temperatures. Evaporation relies on getting rid of the solvent totally.

Answer 2

Crystallization is the (natural or artificial) process of formation of solid crystals from a uniform solution. Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.
Evaporation is the process by which molecules in a liquid state (e.g. water) spontaneously become gaseous (e.g. water vapor), without being heated to boiling point. It is the opposite of condensation. Generally, evaporation can be seen by the gradual disappearance of a liquid, when exposed to a significant volume of gas.