Digital marketing can be as simple as setting bait (an Add) and wishing/waiting for a response, or as complex building CRMs, Algorithms to maximize CTR, Unique content creation etc. Deciding which marketing strategies work best, is a trial and error effort, once a strategy is in place it can be molded and evolve into a unique opportunity to increase revenue.
A disadvantage of digital advertising is the large amount of competing goods and services that are also using the same digital marketing strategies. For example, when someone searches for a specific product from a specific company online, if a similar company uses targeted advertising online then they can appear on the customer's home page, allowing the customer to look at alternative options for a cheaper price or better quality of the same product or a quicker way of finding what they want online.
In February 2000, Amazon announced that it had been granted a patent on components of an affiliate program. The patent application was submitted in June 1997, which predates most affiliate programs, but not PC Flowers & Gifts.com (October 1994), AutoWeb.com (October 1995), Kbkids.com/BrainPlay.com (January 1996), EPage (April 1996), and several others.