Integration testing is a software testing level in which separate units or components are merged and tested together. The intention is to find defects in the interaction among integrated units. This testing verifies that data passes between modules correctly and that they cooperate as expected. It follows unit testing and precedes system testing in the software testing process. Integration testing can be done with various methods like top-down, bottom-up, and big bang. Integration testing identifies problems like interface mismatches, data format faults, and developer assumptions about other modules that are incorrect.

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