Angels have a very similar definition across many religions. They are considered spiritual beings, agents, or messengers of God. The word comes from the Greek, agnelos, meaning messenger.
In Islam, belief in angels is one of the Six Articles of Faith. In addition, Devas and dharma protectors are types of angelic beings in Buddhism. Other religions believe each person has their own guardian angel to help them throughout life.
The Judeo-Christian Bible provides detailed descriptions of angels, with different powers, abilities, and names. Interestingly, when angles are mentioned in these scriptures, they usually appear in human form.