The machinery that falls under this category creates packages out of flexible, heat-sealable plastic film in order to allow for the subsequent filling, closing, and separating of said packages. In addition, paperboard and glue are utilized by some horizontal form, fill, and seal machines. The complete unit that forms, fills, and seals products will move the product horizontally as it forms a package, fills it with the product, seals or otherwise secures the product, and then moves on to the next step in the process.