What does Coinbase do?

Could you elaborate on the role and operations of Coinbase in the cryptocurrency industry? As a leading digital currency exchange, I'm curious to understand how Coinbase facilitates the buying, selling, and trading of cryptocurrencies for its users. Specifically, I'd like to know about its services, such as the wallet functionality it offers, the range of cryptocurrencies it supports, and the security measures it employs to protect its customers' assets. Additionally, I'm interested in how Coinbase contributes to the overall cryptocurrency ecosystem and its position in the broader financial landscape.