A heat sealer is a device used to seal plastic bags or packaging by applying heat to the material. This process melts the edges of the plastic, allowing them to fuse together, creating an airtight seal. Heat sealers are commonly used in food packaging, medical supplies, and various industrial applications to preserve freshness and prevent contamination. There are different types of heat sealers, including hand-held models and automatic machines. The choice of a heat sealer often depends on the thickness of the material and the volume of sealing required. Proper use of a heat sealer ensures that products remain secure and protected during storage and transportation.