An acoustic guitar is a musical instrument that features a hollow body and is played by plucking or strumming the strings with the fingers or a pick. It produces sound through the vibration of the strings, which resonate in the body of the guitar. The rich and warm tones of an acoustic guitar make it a popular choice for various genres of music, including folk, country, and singer-songwriter styles. Its portable nature and versatility make it a beloved instrument for both beginners and professional musicians alike.