An isosurface is a three-dimensional representation of points in a volume that share a common value, often used in scientific visualization. It helps to illustrate complex data sets, such as those found in medical imaging or computational fluid dynamics, by showing surfaces where a specific property, like temperature or pressure, is constant. To create an isosurface, algorithms like Marching Cubes are employed to extract the surface from a 3D grid of data. This technique allows researchers and engineers to analyze and interpret data more effectively, making it easier to identify patterns and anomalies within the volume.