A "relative" link is a link that contains only the information necessary to navigate from the location of the parent file to the location of the child file.
A relative link takes advantage of the fact that your operating system and application software already know the location of the parent file that contains the link. So, in order to get to the child file, it only needs to know the location of the child file relative to the parent file. This might include going up or down in the folder structure, and will always include the name of the child file.
For example, if a parent file located in the “C:\MainFolder” folder, pointed to a child file contained in the “C:\MainFolder\SubFolder” folder, via a link file specification of “C:\MainFolder\SubFolder\Filename.doc”, then the “Force links relative” method would change the link file specification to “.\SubFolder\Filename.doc” or simply "SubFolder\Filename.doc". If the parent file were located in "\Subfolder\", in the same folder with the child file, the relative path would be only the name of the child file: "Filename.doc".
LinkFixer Advanced has the ability, using the Modify Links process, to change your links to their relative format in bulk. “Force links relative” changes the file specification of a link pointing to a child file to be the relative location of the child file with respect to the parent file.