A spline is a mathematical function used to create smooth curves. It is often employed in computer graphics, engineering, and data interpolation to connect a series of points with a continuous line. Splines can take various forms, such as linear, quadratic, or cubic, depending on the desired smoothness and complexity of the curve. In practical applications, splines are used in design software to model shapes and surfaces. For example, in CAD (Computer-Aided Design), designers use splines to create intricate designs and smooth transitions between different elements. This flexibility makes splines a valuable tool in both artistic and technical fields.