Conceptual graphs are a form of knowledge representation that visually depict relationships between concepts. They consist of nodes, which represent concepts or entities, and edges, which illustrate the relationships between these concepts. This graphical approach allows for a clearer understanding of complex information and facilitates reasoning and inference. Developed by John F. Sowa in the 1970s, conceptual graphs are based on first-order logic and can be used in various fields, including artificial intelligence and natural language processing. They provide a structured way to represent knowledge, making it easier to analyze and manipulate information in a logical manner.