Signal strength refers to the measure of the power level of a transmitted signal, such as those used in Wi-Fi, cellular networks, or radio communications. It indicates how well a device can receive and interpret the signal, which is crucial for maintaining a stable connection. Stronger signals typically result in better performance, including faster data transfer rates and clearer audio or video quality. Signal strength is often measured in decibels (dBm) and can be affected by various factors, including distance from the source, physical obstructions like walls, and interference from other electronic devices. Understanding signal strength helps users optimize their connectivity and troubleshoot issues related to internet access or mobile phone reception.