A graphing calculator is a handheld device that allows users to plot graphs, solve equations, and analyze mathematical functions. Unlike basic calculators, graphing calculators can display multiple equations on a single graph, making them useful for visualizing relationships between variables. They are commonly used in high school and college mathematics courses, particularly in subjects like algebra, geometry, and calculus. These calculators often come with advanced features, such as the ability to perform statistical analysis and create 3D graphs. Popular models include those from brands like Texas Instruments and Casio. Graphing calculators are essential tools for students and professionals who need to perform complex calculations and visualize data effectively.