What does it mean to be a sweet savor unto God?

To be a sweet savor unto God, as mentioned in 2 Corinthians 2:15, means that God sees us in Christ, whose perfect life and sacrifice bring us acceptance before Him. As believers, despite our inherent wretchedness, we are covered by the righteousness of Christ, and when God looks at us, He sees His Son. This notion points to the profound grace of God, where He delights in the fragrance of the gospel being preached and sees us as vessels of this divine aroma, representative of His glory in both the saved and the perishing. This reinforces the biblical view that our standing before God is entirely based on the merits of Christ.