Is Optimism a DeFi?

Could you please clarify whether Optimism qualifies as a DeFi? I'm interested in understanding its characteristics and functionalities within the decentralized finance ecosystem. Could you elaborate on its role and how it differs from other platforms in this space? Additionally, are there any specific features or benefits that Optimism offers as a potential DeFi solution? I'm eager to gain a deeper understanding of its position in the rapidly evolving field of cryptocurrency and finance.