The purpose of a technology stack in software applications is to define the set of technologies and tools used for development, deployment, and operation. This encompasses layers like the frontend, backend, and database. A well-structured technology stack helps in ensuring compatibility, improving performance, and enhancing scalability. It also aids developers in making informed decisions about the tools that best suit the application’s needs, thus facilitating easier maintenance and updates over time. Overall, a coherent technology stack is crucial for effective collaboration and successful project execution.