Angels are generally categorized by their roles and proximity to the divine. In Christian theology (based on the Pseudo-Dionysian hierarchy), angels are divided into three distinct spheres containing nine specific orders. 

The First Sphere (Closest to God)

These highest orders are primarily focused on worship and maintaining the cosmic order. 

• Seraphim: The highest order, serving directly in God’s presence as caretakers of the throne. They are often described as having six wings and singing ceaseless praises. 
• Cherubim: Keepers of celestial records and guardians of sacred spaces (such as the entrance to Eden). They are associated with divine wisdom and glory.
• Thrones: Also known as Ophanim, these are the celestial wheels that carry the physical throne of God. They represent justice and divine authority. 

The Second Sphere (Governors of the Cosmos)

These angels act as instruments of divine power, regulating the universe and the stars.

• Dominions: Also called Dominations, they regulate the duties of lower angels and govern the universe, acting as a bridge between the highest spheres and the material world.
• Virtues: Responsible for overseeing the natural order, maintaining the stars and planets, and performing miracles.
• Powers: Celestial warriors responsible for maintaining cosmic balance, they are tasked with countering the forces of darkness and evil. 

The Third Sphere (Active Interaction with Humanity)

These are the angels who deal most directly with the material world and human affairs. 

• Principalities: Also called Principalities/Rulers, they are tasked with overseeing nations, large groups of people, and institutions. 
• Archangels: High-ranking messengers who deliver crucial revelations and lead heavenly forces in spiritual battles (e.g., Michael, Gabriel, and Raphael). 
• Angels: The lowest and most well-known tier. These are the divine messengers and personal guardians assigned to protect and guide individuals in their daily lives.