A transient signal is a type of signal that changes quickly over time, often appearing as a brief spike or pulse. These signals can occur in various systems, such as electrical circuits or mechanical systems, and are typically caused by sudden changes, like switching on a device or a disturbance in the environment. Transient signals are important in fields like engineering and signal processing because they can provide valuable information about system behavior. Analyzing these signals helps engineers design better systems and troubleshoot issues, ensuring that devices operate efficiently and reliably.