Jelly holders are containers used to store jelly, jam, and other spreads. They come in a variety of shapes and sizes, but the most common type is a jar. Jars are typically made of glass or plastic and have a lid that seals the contents inside. The lids can be either screw-on or snap-on, depending on the type of jar. Jelly holders are an essential kitchen item for anyone who enjoys making and eating jams and jellies.