This may seem self explanatory, but refers to the experience a visitor has when on a website and search engines want this experience to be as good as possible. User experience actually encompasses a lot of factors, such as:
As most websites want to achieve more traffic, aiming to appear higher up in search results, ideally on the first page, is a way of accomplishing this. Search engines clearly state that user experience is becoming a larger factor in assessing the quality of your website, as they want the results they display for searches to be quality websites. This will aslo lead to users being more likely come back and remain using their search engine.
Also, for a long time, developers thought there was a technique or "key" to appearing higher up in search results. As in, by following "A", "B" and "C" they could achieve this. This did work for a time but for a long while now Search Engines have been reluctant to reveal exactly what they see as a ranking signal so that there isn't an obvious technique to appearing at the top of search results. Search engines want websites that are built to accommodate people, not to achieve rankings, and so the consideration of the "user" is becoming more prevalent than adhering to search engine "rules".
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