Can you name the main approaches and methods of software product development?

Main approaches and methods for software development include:

• Waterfall Model — sequential execution of phases: requirements analysis, design, implementation, testing, deployment.
• Agile Methodologies — iterative and incremental development with frequent releases and feedback from the customer (e.g., Scrum, Kanban).
• TDD (Test-Driven Development) — development through writing tests before code.
• BDD (Behavior-Driven Development) — focus on system behavior and writing tests in natural language.
• CI/CD (Continuous Integration/Continuous Delivery) — automation of build, testing, and delivery of the product.

The choice of approach depends on the project requirements, team, and customer.