What server is Gmail on?

Excuse me, could you possibly enlighten me on the specific server that Gmail operates on? I'm curious to understand the technical infrastructure behind such a widely used email service. It's fascinating to me how such a vast amount of data and communication is facilitated through a specific server architecture. If you have any insights into the scalability, security measures, or even the geographical location of these servers, I'd be extremely grateful for the information. It's always interesting to learn about the intricacies of modern technology, especially when it comes to something as ubiquitous as Gmail.