SYSLINUX is a boot loader for the Linux operating system which runs on an MS-DOS/Windows FAT filesystem.
PXELINUX is a SYSLINUX derivative, for booting Linux from a network server using a network ROM conforming to the Intel PXE (Pre-Execution Environment) specification.
- ISOLINUX is a boot loader for Linux/i386 that operates off ISO 9660/El Torito CD-ROMs in "no emulation" mode.
- EXTLINUX is a new syslinux derivative, which boots from a Linux ext2/ext3/ext4 or btrfs filesystem. Support for ext4 and btrfs were added in version 4 of extlinux.