Sonar is a software quality management platform that enables developers to access and track code analysis data ranging from styling errors and potential bugs to code defects, duplications, lack of test coverage, and excess complexity. It supports over 20 programming languages. Some key features include over 600 coding rules, standard software metrics, the ability to drill down to source code details, a time machine feature to analyze technical debt and code smells over time, security measures, an extensible plugin system, and integrations with tools like Jenkins. Sonar also covers 7 axes of code quality and has an architecture that allows for analysis of code in a continuous integration workflow.