What is integration testing in simple words?

Integration testing (sometimes called integration and testing, abbreviated I&T) is the phase in software testing in which individual software modules are combined and tested as a group . Integration testing is conducted to evaluate the compliance of a system or component with specified functional requirements.

Who will perform integration testing depends on a company’s practices and preferences. In most organizations, component integration testing is the responsibility of the developer . However, in organizations that have implemented test-driven development, testers may be involved.

System Integration Testing is a sort of software testing that is performed in an integrated hardware and software environment to evaluate the overall system behavior . It is testing performed on a whole, integrated system to determine the system’s compliance with the stated requirements.