A ukulele string is a thin cord used to produce sound on a ukulele, a small, guitar-like instrument. Typically made from nylon, fluorocarbon, or gut, these strings come in different thicknesses and tensions, affecting the instrument's tone and playability. Each ukulele usually has four strings, which are tuned to specific pitches: G, C, E, and A. The choice of strings can influence the overall sound, making it important for players to select the right type for their style and preferences. Regular maintenance and replacement of strings are essential for optimal performance.