This document provides an overview of software development lifecycles and testing. It discusses the typical phases of the SDLC, including planning, analysis, design, implementation, and maintenance. It describes two common SDLC methodologies: the waterfall model and agile/scrum model. It also defines different types of testing like static vs dynamic, verification vs validation, functional testing, regression testing, and smoke testing. Finally, it provides details on unit, integration, system, and user acceptance testing.