What is the term for varying types of selection, and why are most apps either one/the other with no setting

1. Which type of selection is most common and why?
2. What are the three selection types?

Which type of selection is most common and why?

Stabilizing Selection

This type of selection tends to narrow the variation in the phenotype over time. This is the most common type of selection because it is associated with the adaptation of an organism to the environment.

What are the three selection types?

Natural selection on polygenic traits can affect the distributions of phenotypes in three ways: directional selection, stabilizing selection, or disruptive selection.