Linux commands are the set of instructions that can be used to perform various tasks on a Linux operating system. These commands can be used in a terminal or command line interface to perform tasks. These tasks can be managing files and directories, managing system processes, configuring network settings, and more. Some common Linux commands include “ls” for listing files in a directory, “cd” for changing directories. Then “mkdir” for creating a new directory, and “apt-get” for managing software packages. The power and flexibility of Linux commands make it a popular choice among developers and system administrators.