A double stop is a technique used in string instruments, such as the violin or cello, where the player simultaneously plays two notes. This creates a fuller sound and adds harmonic depth to the music. Double stops can be found in various musical styles, from classical to folk, and are often used to enhance melodies or create rich textures. To execute a double stop, the musician must carefully place their fingers on the strings to produce the desired pitches while bowing both strings at the same time. Mastering double stops requires practice and precision, as it involves coordination between the left hand and the bowing hand.