| It is a type of testing that is performed on individual units or components of the software | It is a type of testing that is performed on the entire software system |
| It is usually performed by developers as part of the coding process | It is usually performed by a separate quality assurance team or testing team |
| Its goal is to identify defects in individual units of the software, such as functions, methods, or classes | Its goal is to identify defects in the integration and interaction between different components of the software system |
| It is a white-box testing technique, which means that the tester has access to the internal structure and code of the software | It is a black-box testing technique, which means that the tester does not have access to the internal structure and code of the software |
| It is usually automated using unit testing frameworks and tools, such as JUnit, NUnit, or PHPUnit | It is usually performed manually or using automated testing tools such as Selenium or Appium |
| Its scope is limited to individual units of the software | Its scope is broad and covers the entire software system |
| It is performed early in the software development life cycle | It is performed later in the software development life cycle, after unit testing and integration testing |
