Active matter is a term commonly used in the field of physics and biology to describe systems made up of self-propelled particles or organisms. There are several synonyms to describe this type of matter, such as "living materials," "autonomous agents," "self-driven systems," "self-motile species," "motor organisms," "active media," "colloidal machines," and "active colloids." Each of these terms emphasizes a specific aspect of the characteristics and behavior of active matter. For instance, "living materials" implies that some of these systems can mimic the behavior of living organisms. "Active media" emphasizes the collective behavior of these systems, while "colloidal machines" highlights the nano-scale processes that occur in these systems.