In Christianity, angels are the messengers of God, and take on varying roles throughout the Bible. They serve primarily as messengers but also as counsellors and guides throughout the Old and New Testaments.

In Matthew 18:10 Jesus warns not to despise children because "their angels in heaven always see the face of my Father in heaven." Luke 20:34–36 affirms that, like the angels, "those who are considered worthy of taking part in the age to come and in the resurrection from the dead will neither marry nor be given in marriage, and they can no longer die."
Belief in guardian angels can be traced throughout antiquity; for example, Menander and Plutarch (cf. Eusebius, "Praep. Evang.", xii) and Neo-Platonists, like Plotinus, held the view that guardian angels existed.
PRAYER:- “Oh Guardian Angel whom God, in His Mercy, has assigned to me, direct, govern, guard, and protect me, each day.”

How did Satan become a fallen angel?
He chose to rebel against God, and as a result, the Scriptures seem to say that He was thrown down, he was cast out of heaven. And we're told that he led many with him. So it wasn't just Satan by himself, but there were many, if you will, fallen angels that followed him in that rebellion against God.

In Christianity and Islam, he is usually seen as a fallen angel or jinn who has rebelled against God, who nevertheless allows him temporary power over the fallen world and a host of demons.
How many types of angels are there?
From what we know there are nine types of angels, each with specific characteristics and virtues.
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What are the names of the archangels?
According to the Bible and other religious history, the seven archangels are Michael, Raphael, Gabriel, Uriel, Saraqael, Raguel and Remiel. Each of these angels have a role assigned to them by God.
Who is the biggest angel in Islam?
As per Islamic scripture and the Koran, Israfil is the angel closest and nearest to God. He is said to have four wings and closely communicates with God and the other archangels.

What are the functions of angels?
Each of the archangels have different roles, which include communicating the revelations and word of God to the prophets, glorifying God and taking the soul of a person at the time of death, among others.
angelology /ˌeɪn(d)ʒəˈlɒlədʒi/
Angelology is the study of angels as they are revealed in Scripture. Angels are created spiritual beings who were made by God to serve Him and carry out His will. They are not divine, not human, and not eternal. They are powerful, intelligent, and real, but always under God's authority.
In several places, angels appear just like ordinary humans. In Genesis 18, Abraham welcomes three visitors who appear as men but are later revealed to be the Lord and two angels.
The close connection between the Blessed Virgin Mary and the Holy Angels is one we see throughout her life on Earth: at the Annunciation, the Nativity of her Divine Son, her Assumption into heaven, and finally her Coronation as Queen of Angels and Men.