Organic terminology

Saturated:
Saturated organic compounds have the maxium number of hydrogens.
This means that the compound has no multiple bonds (either carbon-carbon or carbon-oxygen).

Examples of saturated compounds:
 Examples of unsaturated compounds:  

Primary, Secondary and Tertiary:
Alcohols are classified according to the number of bonds to carbon at the C bearing OH.

If the C bearing OH is
bonded to one carbon, the alcohol is primary (1°)
bonded to two carbons, the alcohol is secondary (2°)
bonded to three carbons, the acohol is tertiary (3°)

Examples of alcohols and their classification      
 tertiary  secondary  primary