Why does ezio see altiars ghost?

Ezio sees Altair's ghost in "Assassin's Creed: Revelations" as a manifestation of his connection to the past and the legacy of the Assassins. Altair serves as a guiding figure, providing wisdom and insight into the struggles of the Assassin Brotherhood. This encounter symbolizes the continuity of their shared ideals and the importance of understanding one's history in shaping the future. Altair's presence also emphasizes the spiritual bond between Assassins across generations.