Answer Description
EXT2 (Extended File System 2 or Second Extended File System) is the default file system for most Linux distributions. FAT32 (File Allocation Table - 32 bit) and NTFS (New Technology File System) are used in Windows environments, and HFS+ (Hierarchical File System Plus) is used by Mac OSX.
Wikipedia
The ext2 or second extended file system is a file system for the Linux kernel It was initially designed by Rémy Card as a replacement for the extended file system (ext) Having been designed according to the same principles as the Berkeley Fast File System from BSD, it was the first commercial-grade filesystem for LinuxThe canonical implementation of ext2 is the "ext2fs" filesystem driver in the Linux kernel Other implementations (of varying quality and completeness) exist in GNU Hurd, MINIX 3, some BSD kernels, in MiNT, and as third-party Microsoft Windows and macOS drivers ext2 was the default filesystem in several Linux distributions, including Debian and Red Hat Linux, until supplanted more recently by ext3, which is almost completely compatible with ext2 and is a journaling file system
Ext2 - Wikipedia, the free encyclopedia