Crystallisation can be used to separate a solid solute from its solvent. Re-crystallisation is used to purify samples obtained in the laboratory. But what is a crystal? 

 Find out about fractional distillation ; why it is different from simple distillation and how it can be used industrially

Distillation is used to separate liquids from one another.  Visit this page to see distillation in the laboratory and look at an industrial scale process.

Chromatography is another important separation technique. Several different types of chromatography exist.  

Filtration can be a simple technique used to separate insoluble solids from a mixture or suspension. It has a lot of everyday applications.