The angels were created by God for one purpose: to carry out His will. The Bible says, "Praise the Lord, all his heavenly hosts, you his servants who do his will" (Psalm 103:21).
One way they do this is by watching over God's people and protecting us from the evil schemes of our spiritual enemy, the devil. Although they are largely unseen by us, God's angels are constantly at work to safeguard us -- and when our life's journey is over, they will accompany us into God's presence in heaven forever. The Bible calls them "ministering spirits sent to serve those who will inherit salvation" (Hebrews 1:14).
This should bring you great comfort, for if you have committed your life to Jesus Christ, God has promised that His angels will be with you at all times, to protect and guide you. This doesn't mean we'll never have problems, or that we'll always choose the right path in life -- but it does mean we'll never be snatched from God's loving hands. We aren't to worship the angels or make them the focus of our faith -- but we are to trust God's promise that "he will command his angels concerning you to guard you in all your ways" (Psalm 91:11).
The Bible doesn't say the angels pray for us -- and the reason is because One far greater than the angels already is praying for us: the Lord Jesus Christ. He alone is the divine Son of God, who even now sits in heaven interceding for us (see Hebrews 7:25). Is your faith and trust in Him -- both for today and for eternity?