NAS, or Network Attached Storage, is a dedicated file storage device that connects to a network, allowing multiple users and devices to access and share data. It typically consists of one or more hard drives, organized in a way that provides data redundancy and protection against drive failures. Users can store various types of files, such as documents, photos, and videos, on a NAS system. It often includes features like remote access, automatic backups, and media streaming, making it a popular choice for both home and business environments to manage and secure data efficiently.