Who is Coinbase Inc?

Could you please enlighten me on the identity of Coinbase Inc.? I'm quite curious to know what this company actually represents in the realm of cryptocurrency and finance. Could you provide a brief overview of its operations, its significance in the industry, and perhaps even its key achievements or milestones? Additionally, how does it differ from other players in this rapidly evolving space? I'm eager to gain a deeper understanding of this entity and its role in shaping the future of digital currencies. Thank you in advance for your insights.