The word angel means messenger or envoy; one who carries tidings or news. They are a race of intelligent Beings of a higher order than man. "For Thou hast made him a little lower than the angels." (Psalm 8:5) The angels however are not to be worshipped for they are our brethren.
"And I fell at his feet to worship him and he said unto me, "See thou do it not: I am thy fellow servant and of thy brethren that have the testimony of Jesus." (Rev. 19:10)
In her book, The Christ Highway, Genevah Seivertson writes that the world does not recognize nor accept the truth of the angelic ministry, yet the Bible is full of incidents describing services the angels render to mankind. Their appearance and their work is found in the Bible from Genesis 3:24 to Revelation of John 22:16.
After our Lord's mission on this earth was completed the angels ministered to the disciples
(Acts 5:19-20). This angel ministry was not closed at the time our Lord walked this earth. It is as real and potent now as then. The help and protection of the angels is given to the children of Light today as freely and as unselfishly as in the days of long ago. "For He shall give His angels charge over thee, to keep thee in all thy ways. (Psalm 91:11)
Their office is to guard, direct, guide and carry out the Will of God on earth and in the heavens. "Bless the Lord, ye His angels, that excel in strength, that do His commandments, hearkening unto the voice of His word." (Psalm 103:20)
There are millions and millions of ministering angels serving the Godhead. (Hebrews 12:22) Just as we find the powerful leaders of humanity upon this earth, so there are powerful angels of God leading their hosts to carry out the Will of God. There are Angel Musicians (Rev. 8:6), Angel Singers (Rev. 5:11), Children's Angels (Matthew 18:10) and Protecting Angels (Matthew 2:13)
All these you will find recorded in the Bible but there are many more in the Ministry of the Angels of which there is no written record. The usual appearance of the angels is described in Matthew 28:3, but if you wish to know the leaders of the "Mighty Angels" read Daniel 10:5-6 and Revelations 10:1. Beloved, a study of the Angels of God will bring a greater realization of the power and majesty of God to you.