Integration testing is a key software testing phase that focuses on verifying how different modules or components of a system work together. After individual units have been tested in isolation, integration testing ensures that the interactions between parts—such as APIs, services, and databases—are functioning correctly as a combined whole.

This testing approach helps uncover issues that unit tests often miss, like interface mismatches, data flow problems, and communication errors between modules. By validating component interactions early, teams can detect and fix defects before they escalate into larger problems in later stages of development or in production.

Tools and frameworks that support integration testing, like the ones discussed in the guide, make it easier to automate and maintain these tests, improving both development speed and software reliability.

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https://keploy.io/blog/community/integration-testing-a-comprehensive-guide