What people usually mean
When people speak about an angel of death, they often mean a spiritual being who comes for every person when they die. That picture appears in stories, art, and some religious traditions. But the Bible does not give that role to a single angel with that title.
Scripture does show angels acting as God's servants, including at times of judgement. In the final plague in Egypt, Moses speaks of “the destroyer” passing through the land, while the Lord protects the homes marked by the Passover blood (Exodus 12:23). The passage does not name this destroyer as an angel of death, nor does it say that this being governs all human death.
For the Lord will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the Lord will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you.
Angels can carry out God's judgement
There are other sobering scenes. After David's census, an angel brings judgement on Israel, yet the Lord stops the angel before Jerusalem is destroyed (2 Samuel 24:15-16). In Hezekiah's day, the angel of the Lord strikes the Assyrian army outside Jerusalem (2 Kings 19:35). These accounts show that angels may be involved in God's judgements, but they act under God's command, not independently.
Revelation also mentions an angel called Abaddon in Hebrew and Apollyon in Greek, names connected with destruction. He rules the abyss in that vision, but Revelation does not call him the angel of death or say he is responsible for every death (Revelation 9:11). It is wise not to build a detailed picture beyond what Scripture actually says.
Death is real, but it is not in charge
The Bible treats death as a painful consequence of a broken world. Paul calls it the last enemy, which means death is not something God asks us to celebrate or treat casually (1 Corinthians 15:26). Yet death does not have the final word.
Hebrews says that Jesus shared our humanity and, through his own death, broke the power of the devil, who had the power of death (Hebrews 2:14-15). That does not mean the devil is a neutral official deciding everyone’s time to die. The point is that Christ frees people from slavery to the fear of death.
Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might destroy him that had the power of death, that is, the devil; And deliver them who through fear of death were all their lifetime subject to bondage.
Jesus has the final authority
The risen Jesus tells John that he has the keys of hell and of death (Revelation 1:18). Keys represent authority. Whatever mysteries surround dying, no angel, evil power, or death itself stands above Christ.
For Christians, the central biblical answer is not speculation about which spiritual being may be present at death. It is the promise that Jesus died and rose again, and that he will finally swallow up death in victory (1 Corinthians 15:54-57). If this question comes from grief or fear, bring that honestly to God. The Bible makes room for tears, while also pointing to a hope stronger than the grave.
I am he that liveth, and was dead; and, behold, I am alive for evermore, Amen; and have the keys of hell and of death.