When we look at living things we divide them up into groups and give the groups names. This is called classification.
Living things are classified into groups of different sizes. The biggest groups contain almost everything. The smallest groups have only a few types of living things in them.
The groups are, from large to small:
The domains are Bacteria, Archaea, and Eukarya, but most people still find it easiest to divide things by kingdom.
The five kingdoms are: