A technology stack in product development refers to the combination of technologies, frameworks, and tools used to build and run a software application. It encompasses both the frontend (user interface) and backend (server-side) components, including programming languages, libraries, and databases. Choosing the right technology stack is crucial, as it influences the application’s scalability, performance, and maintainability. A well-defined stack allows developers to leverage best practices and ensure a smooth workflow during the development process.