Characteristics of a software development lifecycle (SDLC) include distinct phases such as planning, design, development, testing, deployment, and maintenance. Each phase serves a specific purpose in organizing the software creation process, ensuring project success. In the planning phase, requirements are gathered, outlining the scope and objectives. The design phase focuses on architectural considerations and user experience. Development involves coding, followed by rigorous testing to identify and fix bugs. Deployment refers to releasing the software, and maintenance involves ongoing support and updates. This structured approach helps manage complexity and improve overall quality.