Is Terra a Cosmos chain?

Excuse me, could you clarify for me whether Terra is indeed a Cosmos chain? I've been reading up on various blockchain technologies and their ecosystems, and I'm a bit confused about the distinctions between them. Cosmos seems to be a platform for interoperable blockchains, and I've seen Terra mentioned in the same context. However, I'm not entirely sure if Terra is a standalone blockchain or if it's part of the Cosmos ecosystem. Could you please elaborate on this matter? It would greatly assist me in understanding the intricacies of this rapidly evolving field.