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A highlighter pen is a writing instrument designed to attract attention to sections of text by marking them with vivid, translucent colors. It features a porous tip made from felt or a similar material, which is saturated with water-based ink. Unlike regular pens that produce opaque lines, the ink used in highlighters is fluorescent or brightly colored yet semi-transparent, allowing the underlying text to be easily readable while emphasizing it. Highlighters are commonly available in a variety of shapes, including traditional pen-like forms with a chisel tip that can create both wide and narrow lines, depending on the angle of application.