The Signal-to-Noise Ratio (SNR) is a measure used to compare the level of a desired signal to the level of background noise. A higher SNR indicates that the signal is clearer and more distinguishable from the noise, which is important in various fields like telecommunications, audio engineering, and data analysis. In practical terms, SNR is often expressed in decibels (dB). For example, an SNR of 20 dB means the signal is 100 times stronger than the noise. Understanding SNR helps improve the quality of communication systems and enhances the clarity of audio recordings, making it a crucial concept in technology and media.