How do we know angels exist according to the Bible?

Angels are a significant part of God's creation, as evidenced in passages such as Colossians 1:16, which states that all things were created by Him and for Him, including the invisible aspects of creation. The Psalms also call upon all creation, including angels, to praise God (Psalm 148). Their interaction with humans is well documented; for instance, in Daniel 9:20-21, the angel Gabriel appears to Daniel during his prayer. Thus, the existence of angels is firmly rooted in biblical truth, as they are acknowledged in both the Old and New Testaments as actively participating in God's divine plan.