A gauge, or measure, is a tool or instrument used to determine the size, amount, or degree of something. It can refer to various devices, such as a ruler for measuring length, a thermometer for temperature, or a pressure gauge for measuring gas or liquid pressure. Gauges help ensure accuracy in various fields, including science, engineering, and everyday tasks. In addition to physical tools, the term "gauge" can also refer to a standard or criterion used to assess quality or performance. For example, performance metrics in business can serve as gauges to evaluate employee productivity or project success. These measurements help inform decisions and improve outcomes.