Have you ever sensed the presence of an angel or even seen one in a vision or met one in human form not realising that it was an angel.? Primarily they are messengers of God and do His bidding. The bible is full of many angel stories, the angels even try to look into the salvation of man but i think they have no revelation on this. The once top angel God’s masterpiece fell from grace after getting proud and now is cast down to the earth to control the sons of rebellion ie the unbelievers in Jesus.
The bible says that angels are God’s servants, just as we are servants to the Almighty God. God can assign an angel/s to a task to help you do His Will if you are engaged in the Kingdom works, but sometimes as a matter of protection an angel may be assigned to you as protection as long as you are speak right. Angels can be assigned to areas such as Michael the Archangel is assigned to the nation of Israel. The now fallen Archangel lucifer was assigned to worship and the covering angel to God’s throne and possibly had dominion over this earth.
Angels were created all at once by the Word of God, millions of them.They were created for different functions and reasons. One of the rank of angels were created to look after us humans ie those who will inherit by adoption into the kingdom of God.