Angels are created beings.

Heb 1:5  For to which of the angels did He ever say: YOU ARE MY SON, TODAY I HAVE BEGOTTEN YOU ? And again: I WILL BE TO HIM A FATHER, AND HE SHALL BE TO ME A SON ?

Angels are spirit beings.

Heb 1:7  And of the angels He says: WHO MAKES HIS ANGELS SPIRITS AND HIS MINISTERS A FLAME OF FIRE.

They are sent to minister to future heirs of salvation.

Heb 1:14  Are they not all ministering spirits sent forth to minister for those who will inherit salvation?

The Bible shows many times where angels have spoken to humans.

Act 12:7  Now behold, an angel of the Lord stood by him, and a light shone in the prison; and he struck Peter on the side and raised him up, saying, Arise quickly! And his chains fell off his hands.

Luk 1:26  Now in the sixth month the angel Gabriel was sent by God to a city of Galilee named Nazareth,

Luk 1:27  to a virgin betrothed to a man whose name was Joseph, of the house of David. The virgin s name was Mary.

Luk 1:28  And having come in, the angel said to her, Rejoice, highly favored one, the Lord is with you; blessed are you among women!

Luk 1:29  But when she saw him, she was troubled at his saying, and considered what manner of greeting this was.

Luk 1:30  Then the angel said to her, Do not be afraid, Mary, for you have found favor with God.

Some of the angels have remained faithful to God.

Psa 91:11  For He shall give His angels charge over you, To keep you in all your ways.

Some have turned away from God and become evil.

Psa 78:49  He sent on them the heat of His anger, wrath and fury and trouble, by sending evil angels.

These evil angels await judgment.

2Pe 2:4  For if God did not spare the angels who sinned, but cast them down to hell and delivered them into chains of darkness, to be reserved for judgment;

Jud 1:6  And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day;

When Christ was resurrected, He went down to hell and preached to the spirits who were awaiting judgement.

1Pe 3:18  For Christ also suffered once for sins, the just for the unjust, that He might bring us to God, being put to death in the flesh but made alive by the Spirit,

1Pe 3:19  by whom also He went and preached to the spirits in prison,

1Pe 3:20  who formerly were disobedient, when once the Divine longsuffering waited in the days of Noah, while the ark was being prepared, in which a few, that is, eight souls, were saved through water.

The angels were given a free choice to follow good or evil, just as we are, some have been faithful to God and some have turned to the devil and his ways.

When we become spirit beings we will judge angels.

1Co 6:3  Do you not know that we shall judge angels? How much more, things that pertain to this life?

Heb 2:16  For indeed He does not give aid to angels, but He does give aid to the seed of Abraham.

Angels do not know all knowledge, they desire to know the things of God, but are not given the things that the called sons of God are.

1Pe 1:12  To them it was revealed that, not to themselves, but to us they were ministering the things which now have been reported to you through those who have preached the gospel to you by the Holy Spirit sent from heaven things which angels desire to look into.

The faithful angels fight the evil angels and beat them.

Rev 12:7  And war broke out in heaven: Michael and his angels fought with the dragon; and the dragon and his angels fought,

Rev 12:8  but they did not prevail, nor was a place found for them in heaven any longer.

Rev 12:9  So the great dragon was cast out, that serpent of old, called the Devil and Satan, who deceives the whole world; he was cast to the earth, and his angels were cast out with him.

Gen 28:12  Then he dreamed, and behold, a ladder was set up on the earth, and its top reached to heaven; and there the angels of God were ascending and descending on it.

Gen 32:1  So Jacob went on his way, and the angels of God met him.

Luk 15:10  Likewise, I say to you, there is joy in the presence of the angels of God over one sinner who repents.

The Arch Angel Michael.

Michael contended with the devil.

Jud 1:9  Yet Michael the archangel, in contending with the devil, when he disputed about the body of Moses, dared not bring against him a reviling accusation, but said, The Lord rebuke you!

Involved with the return of the Father.

1Th 4:16  For the Lord Himself will descend from heaven with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first.

Michael helped Christ against the prince of Persia. Michael is one of the chief princes.

Dan 10:13  But the prince of the kingdom of Persia withstood me twenty-one days; and behold, Michael, one of the chief princes, came to help me, for I had been left alone there with the kings of Persia.

Only Michael can help.

Dan 10:21  But I will tell you what is noted in the Scripture of Truth. (No one upholds me against these, except Michael your prince.

Michael stands up for Israel at the end time.

Dan 12:1  At that time Michael shall stand up, The great prince who stands watch over the sons of your people; And there shall be a time of trouble, Such as never was since there was a nation, Even to that time. And at that time your people shall be delivered, Every one who is found written in the book.

Michael has his own angels.

Rev 12:7  And war broke out in heaven: Michael and his angels fought with the dragon; and the dragon and his angels fought,

It would appear that the angels of God are those who have remained faithful to God.

The ones who have followed Satan are evil angels and await judgment of which we will play a huge part.