The word angel comes from the Greek word for messenger - angelos. They are messengers from spirit allowing us a greater understanding and connection to spirit. Not only are angels messengers, they are also part of our consciousness, representing realms beyond thought and idea. The human mind needs form, so the Light of Spirit takes on the physical form of an angel, to encourage direct communion with God.
Angels are different from guides in that they have not lived an Earth time existence; angels are of the stars and heavens. They are divine beings who do not have karma or evolutionary issues to work out from having lived on Earth. Angels are celestial beings of a higher vibrational level than guides.
The angels have a different way of seeing our situations. They teach us how to use our spiritual senses to know the real world that transcends the illusory world's problems.