Can a US citizen buy from Alibaba?

Good day, I'm curious about something related to e-commerce and cross-border transactions. Specifically, I'm wondering if a United States citizen would be able to purchase products or services from Alibaba, a Chinese e-commerce giant? Are there any restrictions or regulations in place that would prevent an American from engaging in such transactions? It would be great if you could provide some clarity on this matter. Thank you in advance for your assistance.