What behavior is characterized by following or frequenting a person's vicinity?

The behavior characterized by following or frequenting a person's vicinity is defined as stalking. Stalking involves a pattern of unwanted attention, surveillance, or contact that causes the victim to feel fear or distress. This behavior can manifest as repeatedly showing up at a person's workplace or home, monitoring their activities, or sending persistent messages, demonstrating an obsession or fixation on the individual.

Stalking is distinguished from similar behaviors like harassment, which generally refers to a broader range of unwelcome interactions that may not necessarily involve following someone. Intimidation involves making someone feel afraid, but it may not include the persistent following aspect. Choking is a specific act of physical violence and does not pertain to the pattern of behavior described in the question. Thus, stalking is the most accurate term to define such actions.