Analog circuits are electronic circuits that process continuous signals, which can vary in amplitude and frequency. Unlike digital circuits that use discrete values (like 0s and 1s), analog circuits handle real-world signals such as sound, light, and temperature. Common components in these circuits include resistors, capacitors, and transistors, which work together to amplify or modify signals. These circuits are essential in many everyday devices, such as radios, televisions, and audio equipment. For example, an amplifier in a sound system boosts audio signals to drive speakers, allowing us to enjoy music at higher volumes. Understanding analog circuits is crucial for designing and troubleshooting various electronic systems.