Seraphim is a type of celestial or heavenly being in Christianity and Judaism. Tradition places seraphs in the highest rank in the Christian angelic hierarchy and in the fifth rank of ten in the Jewish angelic hierarchy. A seminal passage in the Book of Isaiah used the term to describe six-winged beings that fly around the Throne of God crying "holy, holy, holy". This throne scene, with its triple invocation of holiness (a formula that came to be known as the Trisagion), profoundly influenced subsequent theology, literature and art. Its influence is frequently seen in works depicting angels, heaven and apotheosis. Seraphs are mentioned as celestial beings in an influential Hellenistic work, the Book of Enoch, and the Book of Revelation.

An angel is a non-physical entity or spirit found in various religions and mythologies. In Abrahamic religions and Zoroastrianism, angels are often depicted as benevolent celestial beings who act as intermediaries between God or Heaven and Earth, or as guardian spirits or a guiding influence. Other roles of angels include protecting and guiding human beings, and carrying out God's tasks.
The term "angel" has also been expanded to various notions of spirits found in many other religious traditions. The theological study of angels is known as "angelology"

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