Heard is the past participle of the verb "to hear."
It can be used in a few ways:
1. As part of a verb phrase:
* I have heard that song before.
* He has been heard to say some strange things.
* They had heard the news earlier that day.
2. As an adjective:
* The heard news was shocking.
* He gave a heard opinion.
3. In the phrase "I've heard..."
* I've heard that the restaurant is great. (meaning "I have heard")
4. In the phrase "It is heard that..."
* It is heard that the king will be visiting next week. (meaning "It is rumored that")
It's important to note: "Heard" is often confused with "herd," which refers to a group of animals.
Please let me know if you have any other questions about the word "heard" or if you meant to ask about something else!