What evolutionary stage is algol?

Algol is a well-known binary star system located in the constellation Perseus. It consists of a primary star, Algol A, which is a more massive and evolved main sequence star, and a secondary star, Algol B, that is a less massive star currently on the main sequence. The system is notable for its eclipsing nature, where Algol A periodically obscures Algol B from our view. This unique characteristic allows astronomers to study the evolutionary stages of stars in binary systems.