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An Angel is 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.

Angels are commonly represented by a figure with wings and wearing a long white robe.  They are also sometimes depicted wearing halos which emanate from the angels' head in a glorious wreath of light, serving as a symbol of divine wisdom.  Angels do not die or age, they are immortal, created by God and existing since the Creation.

Angels can take on a variety of different forms. The image of an Angel with wings tends to symbolize the spiritual nature of the being.  The purpose of the wings being to allow the Angel to travel through the ether as well as being a symbol of divine authority. 

The word Angel is thought to be derived from the Greek word
"Angeloi" which means "Messenger".

A Fallen Angel is often classed as a devil, like Satan himself; whereas a Guardian Angel is classed as a human guide or protector.

In Christian mythology, a Fallen Angel is an Angel exiled or banished from Heaven after not obeying God's mandate or rebelling against Him.
An Angel who opposed God and is a follower of Satan the Devil. 
Some refer to these Fallen Angels as Demons

A Guardian Angel is a spirit who is believed to protect and to guide a particular person.   In Catholicism Guardian Angels are believed to be intelligent spiritual creatures assigned to care for and protect every person on earth.  Each person has a Guardian Angel throughout life. These Angels are to assist the person in attaining his eternal salvation.  They can act as emissaries between the person and God.

Others refer to these Guardian Angels as guiding spirits who control or guide and particularly help in personal safety.  Sometimes they are referred as the "Door Keeper" of the medium.
In the Eastern Orthodox Church they are called Guardians. It is believed each person has a Guardian Angel and a Guardian Devil.