Alison DiLaurentis is a fictional character from the popular television series Pretty Little Liars, based on the book series by Sara Shepard. She is portrayed as the charismatic and manipulative leader of a group of friends known as the Liars. Alison's mysterious disappearance sets off the central mystery of the series, leading her friends to uncover secrets and lies in their lives. Throughout the series, Alison is known for her complex personality, often oscillating between being a friend and a foe. Her character explores themes of friendship, betrayal, and the impact of secrets. Alison's return to Rosewood after her disappearance raises questions about her past and the truth behind her relationships with the other characters.