Collaborative filtering is

a process that automatically groups people with similar buying intentions, preferences, and behaviors and predicts future purchases.

the two$-$way buyer$-$seller electronic communication in a computer$-$mediated environment in which the buyer controls the kind and amount of information received from the seller.

the interactive, Internet$-$enabled system that allows individual customers to design their own products and services by answering a few questions and choosing from a menu of product or service attributes, prices, and delivery options.

the consumer$-$initiated practice of generating content on a marketer's website that is custom$-$tailored to an individual's specific needs and preferences.

an Internet$-$enabled digital environment characterized by face$-$to$-$screen exchange relationships and electronic images and offerings.