Highlighter/ˈhaɪlaɪtər/ Definition 1 of 2Pro Tip 1/3Study Aid Highlighters are often used by students to remember key information. I ran out of ink highlighting the main points. Pro Tip 2/3Bright Colors Highlighters usually come in neon colors to make text stand out. Use a green highlighter for the headings. Pro Tip 3/3Visual Organization Highlighters can visually organize notes by color-coding information. Color-code your notes with different highlighters.