Explain the difference between an SDLC and STLC?

 SDLC: It is a systematic approach to develop a software. Requirements are gathered by the BA and reviewed by the developer. In design phase, the high level and low level designs of the software are met. The development of the application or the coding is done in development phase. The deployment of the application is done after passing.

STLC: It is a systematic approach to test a software. It is a part of SDLC. Requirements are reviewed by the testers. In design phase, test cases and test conditions are designed and which are executed in Execution phase. Detailed test cases are written in development phase. Deployment phase is the final stage in testing where testing is completed and reports are generated.