A cult is basically a group of people that come together around a leader. The group is joined together by a common belief or religion practice, and if often led together by a single leader or a group of leaders. This leader often controls the group, and his word is generally considered as law.
Generally, a cult is formed on the basis of false or idolized beliefs that are considered strange or bizarre by others. This is one of the factors why the group joins together in the first place. Cults are infamous for exerting excessive control over members. Some cults have even been infamous for duping its members out of their money.
Another definition of the word ‘cult’ refers to something as having a cult following. For example, an obscure book or movie which has gained a cult following. This means that despite it not being widely famous or popular, it is loved by a small group of people.