h=product (formerly hProduct) is a draft standard intended to be one of several "microformats" released via the microformats.org site and community, intended for the representation of information in a manner that is human-readable but can still be processed by machines. It was renamed (changing the capitalization and punctuation) in the microformats2 reformulation of these standards.
The format encodes data pertaining to products for sale, in the form of standard HTML or XML elements, attributes, and classes which can be inserted into Web pages or other documents. Parts of it make use of embedded data in other microformats such as h-card, hListing, and h-review.
The intent is to cause online stores to be marked up in a consistent manner so that their contents can be analyzed and aggregated.