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.[21] 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.
Technical SEO is becoming more and more complex with mobile, semantic data, and page speed layered on top of more traditional on-site issues. At the same time, the engines have become, and will continue to become, more attuned to truly understanding what a searcher’s needs are and returning the most useful answer, rather than the best optimized, most linked to page.
Video advertising - This type of advertising in terms of digital/online means are advertisements that play on online videos e.g. YouTube videos. This type of marketing has seen an increase in popularity over time.[50] Online Video Advertising usually consists of three types: Pre-Roll advertisements which play before the video is watched, Mid-Roll advertisements which play during the video, or Post-Roll advertisements which play after the video is watched.[51] Post-roll advertisements were shown to have better brand recognition in relation to the other types, where-as "ad-context congruity/incongruity plays an important role in reinforcing ad memorability".[50] Due to selective attention from viewers, there is the likelihood that the message may not be received.[52] The main advantage of video advertising is that it disrupts the viewing experience of the video and therefore there is a difficulty in attempting to avoid them. How a consumer interacts with online video advertising can come down to three stages: Pre attention, attention, and behavioural decision.[53] These online advertisements give the brand/business options and choices. These consist of length, position, adjacent video content which all directly affect the effectiveness of the produced advertisement time,[50] therefore manipulating these variables will yield different results. Length of the advertisement has shown to affect memorability where-as longer duration resulted in increased brand recognition.[50] This type of advertising, due to its nature of interruption of the viewer, it is likely that the consumer may feel as if their experience is being interrupted or invaded, creating negative perception of the brand.[50] These advertisements are also available to be shared by the viewers, adding to the attractiveness of this platform. Sharing these videos can be equated to the online version of word by mouth marketing, extending number of people reached.[54] Sharing videos creates six different outcomes: these being "pleasure, affection, inclusion, escape, relaxation, and control".[50] As well, videos that have entertainment value are more likely to be shared, yet pleasure is the strongest motivator to pass videos on. Creating a ‘viral’ trend from mass amount of a brands advertisement can maximize the outcome of an online video advert whether it be positive or a negative outcome.
Although online marketing creates many opportunities for businesses to grow their presence via the Internet and build their audiences, there are also inherent challenges with these methods of marketing. First, the marketing can become impersonal, due to the virtual nature of message and content delivery to a desired audience. Marketers must inform their strategy for online marketing with a strong understanding of their customer’s needs and preferences. Techniques like surveys, user testing, and in-person conversations can be used for this purpose.

Pay Per Click Advertising (PPC) - While SEO is free, pay-per-click ads are just as they sound; ads you run on a search engine that you pay for each time someone clicks on it. In PPC advertising, you bid the amount you are willing to pay per click. In general, the more you bid, the higher your ad will llikely appear in the search engine results. Google AdWords ​has implemented an additional factor in which your ads are ranked based on the relevancy or importance that Google places on your site, which is very difficult to manipulate. You can also use pay per click advertising to your advantage on your own site. For example, you can make money with Google AdSense and other similar programs.
In addition to measuring your website traffic, you need to track your conversion rates. For example, if, as a result of your search engine marketing efforts, your traffic doubles from 250 to 500 visitors per month, how many new customers did you acquire from the additional 250 visitors to your site? Do you now have twice as many customers as you did before? If you picked up 5 customers your conversion rate would be 2 percent of the new traffic (5 divided by 250) and 1 percent (5 of 500) overall.
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