Why do Christians refer to Jesus as our Savior?

Jesus is called our Savior because through His life, death, and resurrection, He accomplished the full work of salvation. According to Matthew 1:21, He was named 'Jesus' because He will save His people from their sins. His sacrificial atonement on the cross ensures that no sin remains unaccounted for, affirming that through Him, we receive forgiveness and reconciliation with God. This salvation is not by our works but is a gift granted to those who believe in Him, reinforcing the central tenet of the Gospel.