Capacity, in the context of ability, refers to the maximum amount of work or activity that a person or system can handle. It encompasses physical, mental, and emotional limits, determining how much one can achieve or endure. For example, a student may have the capacity to learn a certain number of subjects effectively within a given time frame. In organizational settings, capacity can also refer to the resources available to complete tasks, such as staff, equipment, and time. Understanding capacity helps in planning and optimizing performance, ensuring that goals are met without overloading individuals or systems.