Is Coinbase only for Ethereum?

Is Coinbase solely dedicated to Ethereum, or does it offer a broader range of cryptocurrency services? I'm curious to know if this platform specializes in a single digital asset or if it provides access to a diverse portfolio of cryptocurrencies. Given the increasing popularity of cryptocurrencies, it would be interesting to understand if Coinbase caters to a wider audience with various investment options, or if it remains focused primarily on Ethereum transactions. Could you elaborate on the scope of services offered by Coinbase, particularly in terms of the diversity of cryptocurrencies it supports?