Computer representation of surfaces means that computers can turn a 2D drawing of a surface into a 3D representation of that surface. This helps us to visualize possible designs before building them. To represent surfaces, computers use algorithms or step-by-step instructions to convert the 2D drawing into a 3D one. The computer will look at the drawing and figure out the shape of the surface by looking at the size, position, and angle of the lines in the drawing. It will then create a 3D model of the object that looks the same as the 2D drawing.