What is a Difference between Integration Testing and System Testing?

System testing is a test level after unit tests and integration tests in software testing life cycle, where application as a whole is tested end to end for functional as well as non -functional requirements. It is performed after integration testing. Usability, performance, scalability and secu rity testing are involved.
Integration testing is testing of interconnected units and their interfaces, the data flow between these units and to make sure that feature is working as per expected. it is carried out after unit testing.
Various test approach like top down, bottom up or hybrid integration are carried out during testing.