what is difference between system, integration and end to end testing?

System testing:                                                                                                  

System testing is a type of testing that ensures that the entire system, including all components, is functioning correctly. The objective of system testing is to evaluate the system's compliance with the requirements and its ability to meet its intended purpose. System testing is typically performed after unit testing and integration testing, and it covers the entire system that companies build.

Integration testing:                                                                  

Integration testing is a type of testing that focuses on testing the interactions between different software modules or components. The goal of integration testing is to identify defects in the interfaces and interactions between the components. Integration testing is performed after unit testing and before system testing.

End-to-end testing:                                                                                                

End-to-end testing is a type of testing that verifies that the entire software system works as expected and meets the requirements. End-to-end testing covers the entire system, including all interfaces, and simulates real-world scenarios. End-to-end testing is typically performed after system testing.

In summary, system testing verifies the entire system works correctly, integration testing focuses on testing the interactions between software components, and end-to-end testing ensures the entire software system meets the requirements and works as expected in a real-world scenario.