Analog refers to a method of representing information using continuous signals or physical quantities. Unlike digital systems, which use discrete values (like 0s and 1s), analog systems can vary smoothly over a range. For example, a traditional thermometer uses liquid that expands or contracts to show temperature, providing a continuous reading. In comparison, digital systems convert information into binary code, making it easier to store and process. For instance, a digital clock displays time in distinct numbers rather than a moving hand. While analog can offer more nuanced information, digital systems are often more precise and easier to manipulate.