A property-value pair representing an additional characteristics of the entitity, e.g. a product feature or another characteristic for which there is no matching property in schema.org.<br/><br/><br/><br/>Note: Publishers should be aware that applications designed to use specific schema.org properties (e.g. http://schema.org/width, http://schema.org/color, http://schema.org/gtin13, ...) will typically expect such data to be provided using those properties, rather than using the generic property/value mechanism.

An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Schema.org tools may have only weaker understanding of extra types, in particular those defined externally.

The overall rating, based on a collection of reviews or ratings, of the item.

An alias for the item.

An intended audience, i.e. a group for whom something was created.

An award won by or for this item.

Awards won by or for this item.

The brand(s) associated with a product or service, or the brand(s) maintained by an organization or business person.

A category for the item. Greater signs or slashes can be used to informally indicate a category hierarchy.

The color of the product.

The depth of the item.

A description of the item.

A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.

A Global Trade Item Number ([GTIN](https://www.gs1.org/standards/id-keys/gtin)). GTINs identify trade items, including products and services, using numeric identification codes. The [gtin](http://schema.org/gtin) property generalizes the earlier [gtin8](http://schema.org/gtin8), [gtin12](http://schema.org/gtin12), [gtin13](http://schema.org/gtin13), and [gtin14](http://schema.org/gtin14) properties. The GS1 [digital link specifications](https://www.gs1.org/standards/Digital-Link/) express GTINs as URLs. A correct [gtin](http://schema.org/gtin) value should be a valid GTIN, which means that it should be an all-numeric string of either 8, 12, 13 or 14 digits, or a "GS1 Digital Link" URL based on such a string. The numeric component should also have a [valid GS1 check digit](https://www.gs1.org/services/check-digit-calculator) and meet the other rules for valid GTINs. See also [GS1's GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) and [Wikipedia](https://en.wikipedia.org/wiki/Global_Trade_Item_Number) for more details. Left-padding of the gtin values is not required or encouraged.

The GTIN-12 code of the product, or the product to which the offer refers. The GTIN-12 is the 12-digit GS1 Identification Key composed of a U.P.C. Company Prefix, Item Reference, and Check Digit used to identify trade items. See [GS1 GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) for more details.

The GTIN-13 code of the product, or the product to which the offer refers. This is equivalent to 13-digit ISBN codes and EAN UCC-13. Former 12-digit UPC codes can be converted into a GTIN-13 code by simply adding a preceeding zero. See [GS1 GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) for more details.

The GTIN-14 code of the product, or the product to which the offer refers. See [GS1 GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) for more details.

The [GTIN-8](http://apps.gs1.org/GDD/glossary/Pages/GTIN-8.aspx) code of the product, or the product to which the offer refers. This code is also known as EAN/UCC-8 or 8-digit EAN. See [GS1 GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) for more details.

Indicates a MerchantReturnPolicy that may be applicable.

Indicates a ProductReturnPolicy that may be applicable.

The height of the item.

The identifier property represents any kind of identifier for any kind of [Thing](http://schema.org/Thing), such as ISBNs, GTIN codes, UUIDs etc. Schema.org provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See [background notes](https://schema.org/docs/datamodel.html#identifierBg) for more details.

An image of the item. This can be a [URL](http://schema.org/URL) or a fully described [ImageObject](http://schema.org/ImageObject).

The current approximate inventory level for the item or items.

A pointer to another product (or multiple products) for which this product is an accessory or spare part.

A pointer to another product (or multiple products) for which this product is a consumable.

A pointer to another, somehow related product (or multiple products).

A pointer to another, functionally similar product (or multiple products).

A predefined value from OfferItemCondition or a textual description of the condition of the product or service, or the products or services included in the offer.

An associated logo.

Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See [background notes](https://schema.org/docs/datamodel.html#mainEntityBackground) for details.

The manufacturer of the product.

A material that something is made from, e.g. leather, wool, cotton, paper.

The model of the product. Use with the URL of a ProductModel or a textual representation of the model identifier. The URL of the ProductModel can be from an external source. It is recommended to additionally provide strong product identifiers via the gtin8/gtin13/gtin14 and mpn properties.

The Manufacturer Part Number (MPN) of the product, or the product to which the offer refers.

The name of the item.

Indicates the [NATO stock number](https://en.wikipedia.org/wiki/NATO_Stock_Number) (nsn) of a [Product](http://schema.org/Product).

An offer to provide this item—for example, an offer to sell a product, rent the DVD of a movie, perform a service, or give away tickets to an event. Use [businessFunction](http://schema.org/businessFunction) to indicate the kind of transaction offered, i.e. sell, lease, etc. This property can also be used to describe a [Demand](http://schema.org/Demand). While this property is listed as expected on a number of common types, it can be used in others. In that case, using a second type, such as Product or a subtype of Product, can clarify the nature of the offer.

Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.

The product identifier, such as ISBN. For example: `meta itemprop="productID" content="isbn:123-456-789"`.

The date of production of the item, e.g. vehicle.

The date the item e.g. vehicle was purchased by the current owner.

The release date of a product or product model. This can be used to distinguish the exact variant of a product.

A review of the item.

Review of the item.

URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.

The Stock Keeping Unit (SKU), i.e. a merchant-specific identifier for a product or service, or the product to which the offer refers.

A slogan or motto associated with the item.

A CreativeWork or Event about this Thing.

URL of the item.

The weight of the product or person.

The width of the item.