Search engine optimization encompasses many areas of a website, although most SEO professionals tend to focus on some more than others. HTTP status codes are a good example of an SEO element that most web developers & designers tend to overlook or simply don’t give it as much attention as it should.
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A recommendation engine (sometimes referred to as a recommender system) is a tool that lets algorithm developers predict what a user may or may not like among a list of given items. Recommendation engines are a pretty interesting alternative to search fields, as recommendation engines help users discover products or content that they may not come across otherwise. This makes recommendation engines a great part of web sites and services such as Facebook, YouTube, Amazon, and more.