Hearsay refers to information that is received from other people rather than being directly witnessed or experienced. It is often considered unreliable because it is essentially secondhand information. In legal contexts, hearsay is a statement made outside of the court that is used as evidence, but it is generally inadmissible due to questions about its reliability.
The term "hearsay" originated from the combination of "hear" and "say," indicating that the information is heard from someone else instead of directly knowing it. It traces back to Middle English, with its roots in the Old English words for "to hear" and "to declare."