The systematic grouping of animals and plants into groups or categories based on predetermined criteria is known as classification.
Phylogenetic classification systems show how entities have evolved over time.
The acceptance of natural selection and the idea of evolution put out by Charles Darwin in his book "On the Origin of Species" by Natural Selection led to the creation of this classification system.
Darwin claimed that modern plants and animals evolved from a few ancestral ones after undergoing a few periodical changes.
As a result, phylogenetic classification is based on a group of entities' evolutionary descent.
A phylogram and a cladogram are used to show relationships.