An "Acting Debut" refers to the first performance of an actor in a film, television show, or theater production. This initial appearance is significant as it marks the beginning of their career in the entertainment industry. Many actors start with small roles or background parts before gaining recognition. The debut can occur at any age and in various formats, such as stage plays or movies. For example, Leonardo DiCaprio made his acting debut in the television series Santa Barbara in 1990. A successful debut can lead to more opportunities and help establish an actor's reputation.