Ladder logic is a popular programming language used in programmable logic controllers (PLCs) for industrial automation and control systems. Synonyms for ladder logic include ladder diagram, ladder program, and relay ladder logic. These terms are used interchangeably to describe the graphical programming language that consists of ladder diagrams. As a visual language, ladder logic allows users to create logic diagrams that represent the control process of a system with simple and intuitive graphical symbols. The use of synonyms for ladder logic highlights the importance of this programming language in industrial automation and control systems, where it plays a crucial role in the control and monitoring of processes and machines.