Accessibility is an important concept in many areas, including technology, transportation, and public services. CONVENIENCE refers to the ease of use or access of a product or service, making it more desirable for customers. USEFULNESS is the quality of being useful or beneficial, which can be applied to products, services, or information. AVAILABILITY is the state of being able to be used or accessed, which is essential for any product or service to be successful. Together, these three terms describe the importance of accessibility in providing customers with convenient, useful, and available products and services.