Baptism is an outward symbolic act that demonstrates the inward reality of what God has done in bringing us to faith in Jesus. Just as Jesus died, was buried and rose again, so we too die to our flesh through faith in Jesus' sacrifice for us on the cross and are given new life in Him.
Baptism is a Christian's public declaration of their commitment to Jesus. Through Baptism, Christians celebrate Jesus' transforming work in their lives and show their personal union with Jesus in his death, burial and resurrection.
"Peter replied, 'Repent and be baptized, each of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the Holy Spirit.'" (Acts 2:38, CSB)
"Go, therefore, and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe everything I have commanded you. And remember, I am with you always, to the end of the age." (Matthew 28:19-20)