Is Coinbase legal in US?

I'm curious to know if Coinbase is legal in the United States. I've heard a lot about cryptocurrencies and blockchain technology recently, and Coinbase seems to be one of the most popular platforms for buying and selling digital currencies. However, with the evolving regulatory landscape surrounding cryptocurrencies, I'm concerned about whether Coinbase operates within the law. Could you please clarify if Coinbase is indeed legal in the US and, if so, what are the relevant regulations that it follows? Thank you for your assistance.