What is the meaning of mother Mary's immaculate conception?

The Immaculate Conception refers to the belief in Catholic doctrine that Mary, the mother of Jesus, was conceived without original sin. This doctrine emphasizes her purity and special role in salvation history, as she was chosen to bear the Son of God. It is celebrated on December 8 each year and underscores the belief in God's grace acting in her life from the very beginning. This concept is distinct from the conception of Jesus, which is known as the Annunciation.