What is meant by revelation

Question:
This questioner asks: What is meant by revelation? It was revealed to the messengers and prophets, so how does revelation occur? Is it through inspiration or through persons who appear in that form?

Answer:
Answer: Revelation is of two types: revelation by inspiration, as He (Exalted and Majestic is He) said: {And your Lord revealed to the bee: "Take for yourself mountains, trees, and what they weave"}. (He revealed to it) means (He inspired it with that). And as He (Exalted and Majestic is He) said: {And We revealed to the mother of Moses: "Nurse him, but when you fear for him, cast him into the river"}. This is revelation by inspiration. The second type is revelation by sending, which occurs through an angel between Allah and His messengers. Allah (Exalted and Majestic is He) charges the angel with what He wills of commands and prohibitions, and the angel descends with them to the sent messenger, and the sent messenger conveys them to the people.