Is Coinbase a layer 2?

Excuse me, could you clarify something for me? I've been reading up on blockchain technology and I came across the term "layer 2." Now, I'm aware that Coinbase is a popular cryptocurrency exchange platform, but I'm not entirely sure if it's considered a layer 2 solution. Could you please explain if Coinbase is indeed a layer 2, or if it operates on a different level of the blockchain architecture? I'm quite curious to understand the distinction between the different layers and how they relate to Coinbase's functionality.