Systematics is the field of biology that focuses on:

* Classifying organisms: This involves grouping organisms based on shared characteristics, such as physical traits, evolutionary relationships, and genetic similarities.

* Understanding evolutionary relationships: This involves studying how organisms have evolved over time and how they are related to each other.

* Naming organisms: This involves developing a standardized system for naming organisms, using a hierarchical system with scientific names.

So, while taxonomy is a key component of systematics, it's not a separate field but rather a part of the larger field of systematics.