What is the term for the self-movement of bacteria?

The term for the self-movement of bacteria is motility. This refers to the ability of an organism, in this case, bacteria, to move independently and actively navigate their environment. Bacterial motility is often facilitated by structures such as flagella or cilia that allow for locomotion. Understanding bacterial motility is crucial in various fields, including microbiology and medicine, as it can influence how bacteria spread and cause infections.

Other terms in the question, while related to biological processes, describe different phenomena. Immobility indicates a lack of movement, which is the opposite of the concept being addressed. Phagocytosis and endocytosis are both processes related to the uptake of particles or substances by cells, but they do not pertain to the self-movement of the organism itself. These distinctions clarify why motility is the correct term in this context.