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Mason jars are a type of glass jar that was originally used for home canning and preserving food. They have a screw-on lid and a two-part sealing system that makes them airtight and perfect for storing jams, jellies, pickles, and other homemade goods. Over time, Mason jars have become popular for a wide variety of uses beyond canning, such as storing dry goods, making homemade candles, creating decorative centerpieces, and even as drinking glasses. They come in various sizes and shapes, with the most common being the classic Ball Mason jar design. Their durable and versatile nature has made them a staple in many households and a popular choice for DIY projects and crafts.