Color Correction Service is a photo editing process of enhancing the color and tone of a photograph. In addition, the editing is done to ensure that images have the most realistic color.
"Color correction is a procedure used in stage lighting, photography, television, cinematography, and other fields, in which hue gels, or filters, are used to change the overall color of the light," according to Wikipedia.
This definition, on the other hand, refers to color correcting in post-production prior to shooting. However, the service we're referring to here is post-production, which includes graphic editing. The concept of image color correction is the same as that of pre-production.