Sierra Entertainment is a video game developer and publisher known for its influential role in the gaming industry, particularly during the 1980s and 1990s. Founded in 1979 by Ken Williams and Roberta Williams, the company gained fame for its adventure games, including the popular King's Quest series, which set new standards for storytelling and graphics in gaming. Over the years, Sierra expanded its portfolio to include various genres, such as action and simulation games. The company was acquired by Vivendi Games in 2004, and its legacy continues to influence modern game design and storytelling techniques.