There are three main types of eCommerce platforms SaaS (software-as-a-service) platforms, PaaS (platform-as-a-service) platforms, and on-premises platforms. Both SaaS and PaaS platforms offer online e-commerce solutions. SaaS platforms such as Magento include software only. Once they also add a piece of hardware, they are known as PaaS platforms.
On-premise eCommerce solutions are hosted locally and managed by their IT staff, not configured by another vendor, and not accessible via the cloud.
The most popular eCommerce platforms are Magento, Shopify, WooCommerce, BigCommerce, Wix, Big Cartel, Salesforce Commerce Cloud, Squarespace, and Volusion.