Can you discuss the SDLC methodology and how test engineers employ this in their work?

"SDLC, or the software development lifecycle, is a methodology software that development teams use to create software systematically and cost-effectively. It usually involves leveraging software development models such as agile, lean, and waterfall. Test engineers also follow this framework to develop test cases at each stage of the lifecycle to identify issues so that they can be corrected before they have a greater impact later in the cycle. This is more effective than testing the final product and identifying defects and bugs which then need to be addressed."