El disquete o disco flexible (en inglés, diskette o floppy disk) es un soporte de almacenamiento de datos de tipo magnético, formado por una fina lámina circular (disco) de material magnetizable y flexible (de ahí su denominación), encerrada en una cubierta de plástico, cuadrada o rectangular, que se utilizaba en la computadora, por ejemplo: para disco de arranque, para trasladar datos e información de una computadora a otra, o simplemente para almacenar y resguardar archivos. La disquetera, unidad de disquete o unidad de disco flexible (FDD, del inglés Floppy Disk Drive) es el dispositivo o unidad de almacenamiento que lee y escribe los disquetes, es decir, es la unidad lectora/grabadora de disquetes. Este tipo de soporte de almacenamiento es vulnerable a la suciedad y los campos magnéticos externos, por lo que deja de funcionar con el tiempo o por el desgaste.

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A floppy disk, also called a floppy, diskette or just disk, is a type of disk storage composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic enclosure lined with fabric that removes dust particles. Floppy disks are read and written by a floppy disk drive (FDD). Floppy disks, initially as 8-inch (200 mm) media and later in 5¼-inch (133 mm) and 3½-inch (90 mm) sizes, were a ubiquitous form of data storage and exchange from the mid-1970s into the late 2000s. By 2007, computers were rarely manufactured with installed floppy disk drives; 3½-inch floppy disks can be used with an external USB floppy disk drive, but USB drives for 5¼-inch, 8-inch, and non-standard diskettes are rare to non-existent. These formats are usually handled by older equipment. While floppy disk drives still have some limited uses, especially with legacy industrial computer equipment, they have been superseded by data storage methods with much greater capacity, such as USB flash drives, flash storage cards, portable external hard disk drives, optical discs, ROM cartridges and storage available through computer networks.

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