Buy Smaller Cryptocurrencies with Uniswap

Coinbase is one of the most popular platforms that people use to buy cryptocurrencies. The problem is that a Coinbase user doesn’t have access to many buying choices. Of course, one can always choose other exchanges like Binance and Kraken, but a Coinbase fan like me can access these alternative choices with Uniswap.

The image has been taken from https://uniswap.org/

What is it?