A monitor can intervene, usually at the request of a visitor. A monitor will come into the room and observe the proceedings. If there is a disagreement, the parties involved are asked to refrain from disrupting the room. In most cases, any further disagreement is averted. This may include guiding visitors to various parts of the site for rules, options and links.
Monitors also help new visitors navigate our site.
Monitor capabilities are limited. A monitor cannot see what is taking place in private chat sessions. As such, a monitor has to rely on information provided by other visitors, or information that can be observed directly. A monitor is discouraged from acting without first observing the offending parties. I think I get it now.