The Signal-to-Noise Ratio (SNR) is a measure used to compare the level of a desired signal to the level of background noise. In simple terms, it tells us how much useful information we have compared to unwanted interference. A higher SNR means that the signal is clearer and easier to understand, while a lower SNR indicates that noise is overwhelming the signal, making it harder to detect. For example, when listening to music on a radio, a high SNR means you can hear the song clearly without static or distortion. Conversely, if the SNR is low, the music may be drowned out by noise, making it difficult to enjoy the listening experience.