VirtueMart is an open-source e-commerce system built on the Joomla framework. It has a large international community and is used by both small and large businesses. Some key advantages of VirtueMart include speed, flexibility, freedom, and the ability to boost your business. It allows for customization and modification with low resource usage. The community is large and releases occur on a regular cycle with security patches provided quickly. VirtueMart 3 offers enhancements like improved custom fields and caching.