What does the term "function" refer to in design?

The term "function" in design specifically relates to whether the design works for its intended use. This encompasses how well the product performs the tasks it was created for, addressing user needs and practical applications. Functionality is fundamental in evaluating the effectiveness of a design, as it determines the usability and efficiency of the product in real-world scenarios.

A focus on function ensures that all aspects of the design, including materials, ergonomics, and usability, align with the goals of the user. The other aspects mentioned, such as cost, aesthetics, and sustainability, are important in their own right but do not directly capture what "function" refers to in the context of design. Function emphasizes practicality and usability above all else, making it a critical consideration in the design process.