Highlighters are office tools used to mark and emphasize important texts in documents. They typically come in the form of markers with flat or fine tips and feature fluorescent ink in vibrant colors like yellow, pink, or green. Highlighters are especially utilized for study, research, or organization purposes to underline and highlight key information in books, manuals, documents, or notes. They are useful tools for making specific details or ideas visible and easily recognizable, contributing to improved learning and communication processes.