"Acoustic" refers to anything related to sound, especially how it travels and is heard. For example, an acoustic guitar produces sound through its hollow body, allowing the strings to vibrate and create music without needing electronic amplification. This natural sound quality is often appreciated in genres like folk and classical music. In addition to musical instruments, "acoustic" can describe environments designed to enhance sound quality, such as concert halls or theaters. These spaces are built with materials that help control echoes and improve clarity, ensuring that audiences enjoy a rich listening experience during performances.