Angel n : a spiritual being that is believed to be much more powerful than a human. Angels are composed of ethereal matter, thus allowing them to take on whichever physical form best suits their immediate needs. In Christian, Muslim, Jewish and other theologies an angel can be one who acts as a messenger, attendant or agent of God.
Guardian Angel: Traditionally, a guardian angel is believed to be a spirit or angel dedicated to watching over us. Angels are generally accepted as having individual roles, and the idea of an angel for every human being is a common one. Whether there is one angel for every one of us, or more than one person under the watch of each guardian angel is open to question, but angels are capable of being in more than once place at any time.
If each of us lives out our lives under the watchful gaze of a guardian angel, many of us assume that they intervene in times of danger, steering us from harm. Others believe that they can only guide us in the right direction, whilst some religions such as Islam see them as an observer on our shoulder, noting our behavior.
Angel with Star - clipartpanda.com