An internal hard drive is a storage device located inside a computer that holds all your data, such as files, programs, and the operating system. It uses magnetic disks to read and write information, allowing you to access your documents, photos, and software quickly. Internal hard drives come in various sizes, typically measured in gigabytes (GB) or terabytes (TB), giving you plenty of space for your digital needs. These drives are essential for the overall performance of your computer, as they directly affect how fast your system runs. Many computers now also use solid-state drives (SSDs), which are faster and more reliable than traditional hard drives. However, internal hard drives remain popular for their larger storage capacities and lower costs.