The word angel in English is a fusion of the Old English word engel (with a hard g) and the Old French angele. Both derive from the Latinangelus which in turn is the romanization of the ancient Greek ἄγγελος (angelos), "messenger", which is related to the Greek verb ἀγγέλλω(angellō), meaning "bear a message, announce, bring news of" etc. The earliest form of the word is the Mycenaean a-ke-ro attested in Linear B syllabic script.
Angels are not glorified human beings. Matthew 22:30 explains that they do not marry or reproduce like humans, and Hebrews 12:22-23 says that when we get to the heavenly Jerusalem, we will be met by “myriads of angels” and “the spirits of righteous men made perfect”—two separate groups.
Angels are a company or association, not a race descended from a common ancestor (Luke 20:34-36). We are called “sons of men,” but angels are never called “sons of angels.”
Angels are mentioned at least 108 times in the Old Testament and 165 times in the New Testament. The Scripture speaks about the creation of angels, therefore, it is clear that they have not existed from all eternity (Nehemiah 9:6; Psalm 148:2,5). Colossians 1:16-17 explains:
“For by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things have been created by Him and for Him. And He is before all things, and in Him all things hold together.”
The time of their creation is never definitely specified, but it is most probable that it occurred in connection with the creation of the heavens in Genesis 1:1. It may be that God created the angels immediately after He had created the heavens and before He created the earth—for according to Job 38:4-7, “the sons of God shouted for joy” when He laid the foundations of the earth.
How can you recognise an angel? Though the numbers of occurrences of angelic visitations is growing rapidly, most angels aren’t seen but are felt. There are different ways to tell if you are in the presence of an angel. Often the pure scent of flowers accompanies their presence. Sometimes an angel will announce its presence with a slight breeze even if all the windows are closed. The breeze is the flutter of angel wings. Sometimes you’ll hear the faint sound of bells or chimes or trumpets. I believe that the reason for the sound is that when angels break from their dimension into ours there is an accompanying sound. Sometimes an angelic presence is seen as a flash of light but the most common way to tell if you are in the presence of angels is by the warm wave of love that washes over you. If you feel an angel is standing behind you, it most likely is.