Builders are responsible for creating machines and generating images from them for various platforms. For example, there are separate builders for EC2, VMware, VirtualBox, etc. Packer comes with many builders by default, and can also be extended to add new builders.
source block documentation to learn more
about configuring builders in the Packer language.
For information on an individual builder, choose it from the sidebar. Each
builder has its own configuration options and parameters.