Simply put, ecommerce refers to commercial transactions conducted online. This means that whenever you buy and sell something using the Internet.
Magento is an open-source e-commerce platform written in PHP. The software was originally developed by Varien, Inc, a US private company headquartered in Culver City, California, with assistance from volunteers.
PrestaShop is a freemium, open source e-commerce solution. The software is published under the Open Software License. It is written in the PHP programming language with support for the MySQL database management system.
OpenCart is an online store management system. It is PHP-based, using a MySQL database and HTML components. Support is provided for different languages and currencies. It is freely available under the GNU General Public License.
Shopify is a Canadian e-commerce company headquartered in Ottawa, Ontario. It is also the name of its proprietary e-commerce platform for online stores and retail point-of-sale systems.