What does signal-to-noise ratio (SNR) indicate in a communication system?

Signal-to-noise ratio (SNR) is a critical parameter in communication systems that quantifies the strength of the desired signal in comparison to the background noise. A higher SNR indicates that the signal stands out more clearly from the noise, which is essential for achieving reliable communications. In practical terms, a good SNR allows for better data integrity and fewer errors in communication, leading to clearer audio and more reliable data transmission. This metric is vital in various scenarios, such as cellular networks, audio systems, and data communications, where distinguishing the intended signal from interference is crucial for optimal performance.