A testing approach that verifies the interfaces and interaction between integrated software modules or systems. It focuses on data flow and communication between components rather than individual unit functionality.
From Latin 'integratus' meaning made whole or renewed, combined with testing. The concept emerged in the 1960s as software systems grew more complex and modular, requiring verification that separate components work together correctly when combined.
Integration testing is like testing whether different musical instruments can play together in harmony - each instrument (unit) might sound perfect alone, but integration testing reveals if the drummer is too loud or if the guitar is in the wrong key! This catches the 'it works on my machine' problems that unit tests miss.
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