Digital identity refers to the ways and means that identity is created and perceived in the digital world, i.e., online. It includes unique descriptive data, as well as information about relationships. That is, it defines a thing both in and of itself and in relationship to other things. Both a person and a company can have a digital identity and while a person always has a concrete identity in the world, businesses may have a storefront identity and establish a digital presence as they establish an online presence in order to do business online. Alternatively, the digital identity may be the one and only identity. Barnes & Noble® is an example of the first type of business; Amazon® is an example of the second.