Ext File Systems are a family of file systems used by the Linux operating system. The most common versions include Ext2, Ext3, and Ext4. These file systems manage how data is stored and retrieved on disk drives, ensuring efficient organization and access. Ext4, the latest version, offers improvements over its predecessors, such as larger file sizes and faster performance. It supports journaling, which helps protect data integrity by keeping a log of changes. Overall, Ext File Systems are essential for managing data in Linux environments, providing reliability and efficiency.