Snipcart is an e-commerce solution that allows developers to turn any website into a fully functional online store by simply integrating their existing HTML. It provides a customizable shopping cart platform that can be easily added to a website without needing to modify its design or structure significantly. Snipcart supports inventory management, payment processing, and order tracking, and it is compatible with various platforms and technologies, making it flexible for developers. The platform also offers analytics and marketing tools, enhancing the overall shopping experience for users.