Taboo is a collaborative learning technique where students work in groups to describe a topic to other group members without using forbidden "taboo" words related to the topic. The activity involves preparing a list of taboo words for a topic, splitting into groups, giving each group the topic and taboo words, and having group members take turns describing the topic while avoiding the taboo words. Variations include allowing groups to add more taboo words after correctly guessing the topic to increase difficulty. The purpose is to familiarize students with a topic through creative word association while applying and creating with constraints.