Punchout in eCommerce simply means accessing other domain (website) from a web application.
It eliminates the need for suppliers to send whole catalogs to buying organizations.
Instead, suppliers send just short index files that name their storefronts (store
information), product categories, or products.
Let say you have a website that sells computer parts and products, which are memory,
printers supplies, desktop computers and servers, rather than providing these entire
product catalogs, we can use existing website that sells printer supplies.