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Integration testing ensures that individual software modules work together as expected. It detects interface defects and interaction issues between modules. The goal is to validate the proper flow of data and functionality across integrated components before moving to system testing. There are several types of integration testing: - 𝐁𝐢𝐠 𝐁𝐚𝐧𝐠: All modules are tested together. - 𝐈𝐧𝐜𝐫𝐞𝐦𝐞𝐧𝐭𝐚𝐥: Modules are integrated and tested one by one (top-down, bottom-up). - 𝐇𝐲𝐛𝐫𝐢𝐝: Combines both approaches. - 𝐒𝐭𝐮𝐛𝐬/𝐃𝐫𝐢𝐯𝐞𝐫𝐬: Used when dependent modules aren't available. Key benefits include early bug detection, smooth communication between modules, and better data flow validation. Best practices involve testing with real dependencies, using separate test databases, automating tests, and writing granular cases focusing on component interactions.