Drive bays are designated spaces within a computer case or server where storage devices, such as hard drives or solid-state drives, can be installed. They come in various sizes, typically 2.5-inch or 3.5-inch, to accommodate different types of drives. Drive bays allow for easy installation and replacement of storage devices, making it simple to upgrade or expand a system's storage capacity. Many modern computers and servers feature hot-swappable drive bays, which enable users to replace drives without shutting down the system. This is particularly useful in enterprise environments where uptime is critical. Properly managing drive bays can enhance overall system performance and data accessibility.