Jesus is Lord - Romans Chapter 10 v 9
Here is a five-part answer: They are …
The angels are real beings created by God who, because they are spirit beings, are normally invisible to the human eye. According to the Bible, the total number of angels is beyond all human computation. Often they are referred to by such terms as the "host of heaven," the "joyful assembly" and the "mighty ones." When God created the universe he also created a vast number of angelic creatures at the same time.
Two angels are named in the Bible–Michael the archangel and Gabriel who is something like a divine press secretary. For instance, he's the one who announced to Mary that she would give birth to Jesus the Messiah (Luke 1:26-38). Furthermore, it appears that the angels are organized into various groups. For instance, the Bible speaks of the cherubim and the seraphim. It also uses terms such as "thrones," "powers" and "authorities" to describe the various ranks of angels.
However, the Bible doesn't reveal everything we'd like to know- our knowledge of angels is small compared to the vast reality that is hidden from our eyes.