"Функциональные" refers to items or systems designed to serve a specific purpose or function. This term is often used in various fields, including design, architecture, and technology, to emphasize practicality and usability. For example, a functional chair is designed not just for aesthetics but also for comfort and support. In the context of functional programming, the term highlights a programming paradigm that treats computation as the evaluation of mathematical functions. This approach focuses on writing code that is clear and predictable, making it easier to understand and maintain. Overall, "функциональные" emphasizes efficiency and effectiveness in design and implementation.