Cute Young Red Haired Girl Wearing Red Stockings And Angel Wings

— Guide for the Perplexed II:4, Maimonides
According to Kabalah, there are four worlds and our world is the last world: the world of action (Assiyah). Angels exist in the worlds above as a 'task' of God. They are an extension of God to produce effects in this world. After an angel has completed its task, it ceases to exist. The angel is in effect the task. This is derived from the book of Genesis when Abraham meets with three angels and Lot meets with two. The task of one of the angels was to inform Abraham of his coming child. The other two were to save Lot and to destroy Sodom and Gomorrah.