A causal loop is a set of events that can create a cycle of cause and effect. It's like a loop because the cause of one event is the effect of a different event, which then becomes the cause of the first event, creating a cycle. For example, if it's cold outside, you might put on a jacket to keep warm. This can create a causal loop because the jacket makes you warmer, so you stay outside longer, and then you get colder again, so you put the jacket on again to stay warm. The cause (being cold) is also the effect (putting on the jacket) and this creates a cycle.