I'm doing a quick search on the topic of revelation to gather sources on revelation. Here's 3 scriptures that stood out to me on the first page.
Mormon 9:7
And again I speak unto you who deny the revelations of God, and say that they are done away, that there are no revelations, nor prophecies, nor gifts, nor healing, nor speaking with tongues, and the interpretation of tongues;
So many people today believe that God stopped speaking to us after the original Apostles died. This scripture shows us that God will never stop speaking to His children. I believe that He will never stop speaking to us, personally and through prophets, because He will never stop loving us.
Doctrine and Covenants 90:13-14
13 And when you have finished the translation of the prophets, you shall from thenceforth preside over the affairs of the church and the school;
14 And from time to time, as shall be manifested by the Comforter, receive revelations to unfold the mysteries of the kingdom;
An example of direct revelation to the Prophet from God. In some ways, this is progressive revelation, since it happens "from time to time." This means that even prophets receive little pieces of truth at a time, even when it's something great and important such as the organization of the Church. Think about when Pres. Gordon B. Hinckley revealed that we would be building smaller temples throughout the world. It was through lots of small, consistent promptings that he and the Brethren learned what they should do.
Ephesians 3:3
[...] by revelation he made known unto me the mystery [...]
The purpose of revelation is to bring to light things that ordinarily cannot be known. For instance, the existence of God is impossible to know for a fact though science, mathematics, or other empirical methods. Only through direct and personal revelation can His existence be known.
