Magnetic discs are storage devices that use magnetic fields to read and write data. They are commonly found in devices like hard drives and floppy disks. The data is stored in tiny magnetic regions on the disc's surface, which can be altered by a read/write head that moves across the disc. These discs are known for their ability to store large amounts of information in a compact form. They are often used in computers and other electronic devices to save files, programs, and operating systems. The technology behind magnetic discs has evolved over the years, leading to faster and more reliable storage solutions.