Software Development Life Cycle (SDLC) and Software Testing Life Cycle (STLC) are important parts of software engineering. SDLC has a broad scope; it consists of 6 phases: requirement analysis, design, development, testing, deployment, and maintenance. On the other hand, STLC is a subset of SDLC. It has Focused scope, specially focus on the testing phase of SDLC. The Primary Goal of STLC is to ensure the quality, functionality and reliability of software through various testing activities.