Spice jars are small containers designed to hold various types of spices and seasonings used in cooking. They come in different shapes, sizes, and materials, such as glass, plastic, or metal. Spice jars often have lids that can be screw-on, flip-top, or shaker-style, allowing for easy access and controlled pouring of the contents. These jars help keep spices fresh and organized, preventing moisture and air from degrading their flavor. Many people use spice racks or cabinets to store their spice jars, making it convenient to find and use ingredients like cumin, paprika, or oregano while preparing meals.