Why is Jesus called the only begotten Son?

The term 'only begotten' signifies that Jesus holds a unique relationship with the Father, distinct from all other believers who are called children of God. John 1:14 states, 'the Word was made flesh, and dwelt among us... the only begotten of the Father,' which establishes His distinctiveness in nature and essence. John 3:16 reiterates this truth by stating that God gave His 'only begotten Son,' highlighting that salvation is through Him alone. This unique status underscores the foundational belief that Jesus is the sole mediator between God and man, affirming His divine authority.