Usefulness refers to the quality or characteristic of being helpful, beneficial, and effective in achieving a particular purpose. In other words, it describes something that is useful, which means it serves a practical function and provides value by solving problems or fulfilling needs. The concept of usefulness can apply to various aspects such as objects, ideas, information, skills, or behaviors - anything that has the potential to be helpful in some way. In essence, usefulness refers to how effective something is at achieving its intended purpose and providing value to those who use it.