As a noun:
* It refers to the concluding part of a musical composition, typically bringing the piece to a satisfying close.
As an adjective:
* It describes something that is related to or resembling a coda, often implying a sense of closure or finality.
The specific part of speech depends on the context in which it's used.
For example:
* Noun: "The symphony ended with a beautiful coda."
* Adjective: "The movie had a coda scene that showed the characters years later."