A trilogy is a set of three related works, often in literature, film, or other forms of storytelling. Each part of a trilogy typically builds on the previous one, creating a cohesive narrative arc. Famous examples include The Lord of the Rings by J.R.R. Tolkien and The Hunger Games series by Suzanne Collins. Trilogies allow for deeper character development and more complex plots than standalone works. They can explore themes and ideas over a longer span, giving audiences a richer experience. Many trilogies are planned from the start, while others may evolve as a series gains popularity.