A Sequential Function Chart (SFC) is a graphical representation used in automation and control systems to illustrate the sequence of operations in a process. It helps in visualizing the steps involved, making it easier to understand how different functions interact over time. SFCs are commonly used in programming languages like IEC 61131-3 for programmable logic controllers (PLCs). In an SFC, each step represents a specific action or state, while transitions indicate the conditions that trigger movement from one step to another. This structured approach aids engineers and technicians in designing, analyzing, and troubleshooting complex systems, ensuring efficient operation and clarity in communication.