The original Greek text says ponerou which translates to “the Evil one” rather than just “evil.”
The Evil One is the Devil, the Prince of this World, the Prince of Darkness, the Author of All Lies, the Son of Perdition, the Accuser, etc.
This last part of the Lord’s Prayer is a request for deliverance from the power of the enemy. Satan hates mankind, since God took on a human nature and not an angelic one. Humanity, although inferior to angelic nature, has been raised above the angels since we can call Jesus brother, but they can only call Him King.
This is not a request for exorcism but a prayer for protection from the influence of the Devil. When he tempted Adam and Eve, he distorted the truth; and when he lies to us, it is the same principle.
Evil is not the opposite of good, and it is not equal to good. Evil is the privation or absence of a good where it belongs. If a rock is blind and cannot see, that is not a physical evil, since rocks have no eyes are not supposed to see. If a man or woman commits sin, that is evil since we are supposed to and are intended to do good.
This part of the prayer asks that physical, moral, and spiritual evils be placed out of our path. The Devil will use whatever he can to tempt us, but his power is not unlimited. By contrast, God’s power always prevails.