Testing plays an important role in all the phases in SDLC.
In the Deveopment phase reviews will be held after completion of each module whether the module is built according the way they want(Verification)
In the testing phase after getting the build the testing is done to check whether the Build is developed according to the clients requirements(Validation)
SDLC: Software Development Life Cycle is the process of building the application or product or project through different phases.
Requirement - H/w S/W Resources Plan Team Size Budget and etc Analysis - Requirements Functional Spec's BRS FRS SRS Usecase Test Cases Testplan Design - HLDD LLDD Detailed Design Documents. Coding - BY LLDD the modules designed by an indivisual logic for every module Testing - Smoke Testing Functional Testing Integration Testing and System Testing. Implementing Maintainance - Port Testing Change Request Enhancement and etc.