Did you know that 85% of Facebook video is watched with no sound? Many people watch videos in places where they can't turn the sound up, or where there's background noise. Those are two important reasons why video captions matter. And, of course, video captions matter for accessibility. Include captions, and you will improve you click-through rate as those with hearing loss or impairment can still understand your video content. Captions also help with SEO by providing text that search engines can find.
In 1998, two graduate students at Stanford University, Larry Page and Sergey Brin, developed "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links. PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer. Internet Marketing
Not every single ad will appear on every single search. This is because the ad auction takes a variety of factors into account when determining the placement of ads on the SERP, and because not every keyword has sufficient commercial intent to justify displaying ads next to results. However, the two main factors that Google evaluates as part of the ad auction process are your maximum bid and the Quality Score of your ads. Search Engine Optimization (SEO)