A "Packer" is a tool or software used in various industries to prepare and package products for shipping or storage. In the context of software development, it refers to a tool that automates the creation of machine images, allowing developers to build and configure virtual machines or containers efficiently. In the realm of logistics, a packer is often a person responsible for assembling and packing products into boxes or containers for distribution. This role is crucial in ensuring that items are securely packaged to prevent damage during transit and that orders are fulfilled accurately for customers.