A highlighter is a writing instrument that comes in various shapes and sizes, typically used to mark or highlight text by applying color to specific words or phrases. It can be handheld with an attached felt tip pen or a separate disposable marker, or it may be a permanent fixture on a desk or table for use with dry-erase markers. Highlighters are commonly used in education and office settings to draw attention to important information, make notes, or highlight key points while reading textbooks, articles, reports, or other written materials.