Gel ink is a type of ink used in pens that combines water-based dye with a thickening agent, creating a smooth and vibrant writing experience. This ink flows easily, allowing for consistent lines and quick drying times, making it popular for everyday writing tasks. Unlike traditional ballpoint ink, gel ink offers a wider range of colors and is less likely to smudge. Many people prefer gel ink pens for their ability to produce bold, clear lines, making them ideal for both note-taking and artistic applications. Popular brands include Pilot and Uni-ball.