A Marker is a component that is used by Characters as destination points. It allows to define a target position and rotation so the Character is at the correct location before doing something else, like opening a door.
A Marker has a yellow shaped arrow that indicates the direction the Character will face after moving towards it.
Optionally, a Marker can specify a Stop Distance threshold from which a Character is considered to have reached its destination.
By default it's zero, but if the destination is a very crowded, there might not be enough space for a character to be at the exact marker's position. Having some error threshold allows Characters to more or less reach their destination without getting stuck or pushing other characters around.