Lenticular lenses are specialized optical devices that consist of a series of magnifying lenses arranged in a way that allows for the creation of images with depth and movement. They are often used in applications like 3D displays, where they can create the illusion of three-dimensional images without the need for special glasses. These lenses work by bending light in specific directions, allowing viewers to see different images based on their angle of observation. Lenticular printing is a common technique that utilizes these lenses to produce images that change or appear animated as the viewer moves, making it popular in advertising and novelty items.