Electronic Ink is a paperlike display used primarily in eBook readers such as Amazon's Kindle.
E Ink technology works by using tiny microcapsules that are suspended in liquid placed within a film-like layer. The microcapsules, which are about the same width as human hair, contain both positively charged white particles and negatively charged black particles.
E Ink displays are especially popular due to their resemblance to printed paper. Besides being considered by many as easier on the eyes, E Ink also boasts lower power consumption, particularly when compared to traditional backlit liquid crystal display (LCD) screens. These advantages, along with adoption by major eReader manufacturers such as Amazon and Sony, have caused E Ink to dominate the eBook reader display market.