Here's why:
* Points to a specific group: "Them" refers to a group of people or things that have already been mentioned or are understood in the context.
* Indicates distance: Demonstrative pronouns like "them" can be used to indicate distance or closeness, though "them" generally refers to something further away than "these" or "those."
Example:
* "I saw the children playing in the park. I waved to them." "Them" points to the children previously mentioned.