Incremental and iterative SDLC model is a way to model software development lifecycle. It is based on the idea that the incremental approach is faster and more efficient than iterative approaches. Incremental SDLC Model: Incremental SDLC model is a process where we start by creating an initial design (the initial design consists of requirements, functional requirements, and domain-specific requirements) then we proceed to a series of incremental steps. We use this process to generate new features or changes in existing features. This approach ensures that the software evolves continuously while maintaining high quality standards.