Side by Side Graphs refer to a method of visually comparing two or more sets of data on separate but adjacent graphs. This technique is particularly useful in illustrating how different variables interact within a market structure, such as perfect competition, where supply and demand curves can be displayed alongside each other to show equilibrium price and quantity. By placing these graphs next to each other, it allows for a clearer understanding of the relationships and shifts in the market, which is crucial for analyzing firm behavior and market outcomes.