Why is Mary called the Immaculate Conception?

The doctrine of the Immaculate Conception teaches that Mary, the mother of Christ, was conceived without sin and her conception was thus immaculate. Mary’s sinless conception is the reason why Catholics refer to Mary as “full of grace”. The Feast of the Immaculate Conception is celebrated by Catholics on December 8th each year.

Misconsception:

Many people confuse the Immaculate Conception with the “virgin birth”; the belief that Mary gave birth to Jesus while remaining a virgin. They are not the same thing.