The term "good design" is used to describe a product or object that has been designed effectively and functionally, is aesthetically pleasing, and meets the needs of the user. In other words, good design combines appearance, function and usability in a balanced way. These elements are important because they help create a product that is not only beautiful to look at, but also easy and pleasant to use. Good design is also often sustainable, environmentally friendly, and long-lasting, making it an attractive choice for many people. In summary, we say "good design" because it describes a product designed with a combination of aesthetics, functionality and sustainability that makes it a great choice to buy.