Robot software is the coded commands that tell the robot what tasks to perform and control its actions. Robot software is used to perform tasks and automate tasks to be performed. Programming robots is a non-trivial task. Many software systems and frameworks have been proposed to make programming robots easier.
Robots like Personal computers have an operating system which changes over time. As, newer generations of robots have been designed so has their operating systems. Different robot manufactures have different programming languages.
Just understanding how to use a teach pendant, which is the device used for programming the robot, is only the start. Robotic automation programming skills are important. The value is created when the programmer can design the best logical process to manipulate the robot to move and coordinate the tasks in a given time.