Usability refers to how easy and enjoyable it is for people to use a product or service. This concept is especially important in areas like software design, where a user-friendly interface can make a big difference. When a product is usable, users can complete their tasks efficiently without confusion or frustration. Good usability often involves clear instructions, intuitive navigation, and responsive design. For example, a well-designed website allows visitors to find information quickly, enhancing their experience. Companies like Apple and Google prioritize usability to ensure their products meet user needs and expectations, leading to higher satisfaction and loyalty.