* Somatic cells are all the cells in your body except for gametes (sperm and egg). They are diploid, meaning they have two sets of chromosomes (one from each parent). Examples include skin cells, muscle cells, and nerve cells.

* Gametes (sperm and egg) are the sex cells involved in reproduction. They are haploid, meaning they have only one set of chromosomes. This is because when a sperm and egg fuse during fertilization, they combine to form a diploid zygote (the first cell of a new organism).

* Ovum is another name for the female gamete (egg). It is therefore haploid.

In summary:

* Diploid: Somatic cells

* Haploid: Gametes (including ovum)