An Episode can be defined as a significant event in the time line of an entity (individual person, community, group etc) that has occurred due to a sudden increase of tweet volumes of the entity from its regular volumes.
The idea of an Episode that has been proposed is different from the past studies on trending topics and also events. An episode occurs when there is a huge attention that has been attracted due to the occurrence of a single event. Trending topics can be for larger duration and the reason (number of events) for it to be trending can be changing and be different at different points of time. All episodes are events but not all events can be episodes. Episodes are significant events with respect to an entity, but events are more general not specifically related to entities. Episodes are always referred for an entity.