In the theology of The Church of Jesus Christ of Latter-day Saints, angels play a crucial role as divine messengers, instruments of God's will, and participants in the eternal plan of salvation. Their functions, nature, and the processes through which they come to be angels are understood in a way that reflects both traditional Christian doctrine and distinctive Latter-day Saint teachings.

In Latter-day Saint theology, angels are considered to be spirit beings who are, in most cases, individuals who once lived as mortals on Earth. Angels are not regarded as a separate class of being entirely apart from humanity, but as part of a continuum of existence that encompasses mortal life, post-mortal life, and the potential to become exalted beings in the presence of God. Thus, in this view, angels are distinct from God, who is an eternal, perfected being, and from humans, who are currently in their mortal probation, but they share a common ancestry as children of Heavenly Father.

While angels are commonly thought of as messengers of God, they also serve as ministers to mortals, provide comfort, guidance, and protection, and deliver messages of great importance, such as those foretelling the birth of Jesus Christ or providing instruction in the establishment of God's kingdom on Earth. These angels, often described in the scriptures, are described as being powerful, yet humble, acting in the service of God's purposes.

There are various kinds of angels in Latter-day Saint theology:

1. Resurrected Beings: Angels can be individuals who have been resurrected. These are often righteous people from the past who now have a perfected, glorified body.
2. Translated Beings: Some angels are translated beings. They haven't yet undergone resurrection but have been changed in such a way that they do not experience pain or death until they are resurrected. A good example from scripture would be the Three Nephites or John the Beloved.
3. Spirits of Just Men Made Perfect: These angels are the spirits of those who have not yet been resurrected but have lived righteous lives and are now serving as angels.
4. Ordinary Humans: Sometimes, in a more symbolic sense, individuals can act as "angels" to others by being messengers or helpers in fulfilling God's work on Earth.

Angels in the Church often serve roles such as providing guidance, protection, and revelation to God's children. They can appear in visions, dreams, or even manifest physically, as we read in scriptures and Church history.

Angels hold a significant and multifaceted role in the theology of The Church of Jesus Christ of Latter-day Saints. Their purpose is not only to act as messengers and divine agents, but also to assist in the ongoing work of salvation. Their origins, rooted in the pre-mortal existence and the experience of mortality, reflect the Church’s broader understanding of human potential, which includes the possibility of progressing beyond mortal life into roles that serve God’s eternal plan. The distinction between cherubim, seraphim, and other classes of angels highlights the diversity of divine beings that play critical roles in the administration of God’s work, both in the temporal and eternal realms. In all cases, angels serve the fundamental purpose of advancing the work of God, guiding His children, and preparing them for exaltation.