Is Cosmos similar to Polkadot?

I've been hearing a lot about Cosmos and Polkadot lately, and I'm wondering if there's any similarity between the two. Both seem to be focused on interoperability and connecting different blockchains, but I'm not quite sure how they compare. Could you please elaborate on the similarities and differences between Cosmos and Polkadot? I'm particularly interested in how their architectures and functionalities differ, as well as their respective ecosystems and the projects building on top of them. It would be great if you could provide a high-level overview of each platform and how they fit into the broader crypto and finance landscape. Thank you in advance for your insights!