highlight meaning in Information Science terminology / glossary / dictionary is:
To use a broad-tipped pen to mark in light-colored ink a section of text in a book or document, usually for future reference. College textbooks donated to libraries are often heavily highlighted. In a similar fashion, the “edit” option in some computer applications allows the user to mark in shaded or contrasting background portions of electronic text to be cut or copied. In a more general sense, to give prominence to the part of a whole that is the most outstanding, interesting, pertinent, useful, etc.