What is GDAX (Coinbase pro)?

Could you elaborate on what GDAX, now known as Coinbase Pro, represents in the world of cryptocurrency and finance? I'm curious to understand its significance and how it differs from other exchange platforms. As a professional in this field, I'm interested in knowing the key features and services that Coinbase Pro offers, as well as its reputation and reliability in the market. Could you provide a brief overview of its history, how it functions, and what types of traders it caters to? Additionally, I'd like to know if there are any specific advantages or disadvantages of using Coinbase Pro compared to other exchanges.