Coinbase is a centralized platform that facilitates the easy use of digital currencies (cryptocurrencies) for both consumers and merchants. This includes not only buying and selling of crypto, but also cold and cloud storage and tools for merchants.
Coinbase was started in 2012 in San Francisco, California, initially supporting Litecoin and Bitcoin only. Being one of the very first platforms that offered easy access to crypto for the masses, the company has grown to more than 20M+ users. They have raised more than $217 million funding from well-known VC firms like Andreessen Horowitz.
They currently offer a desktop solution, as well as a mobile app. One of the very few companies that allow you to buy cryptocurrencies with your credit card.