The quality of backlinks is determined by various factors. These include, firstly, the presented figures, because a website for example, a high IP popularity has is from search engines rated higher. Accordingly include links from these sites more. The same applies to PageRank and TrustRank . But there are other factors that directly relate to that side on which a backlink is. These are presented below.
Google knows the link-giving website
A backlink can only have a positive effect, if Google also of the existence of this link has knowledge . This can be checked, for example, if the URL to look on the page giving the link is to reach out to Google to enter it. The URL should now show up in search engine results. For a greater number of links can be tested to the Google index checker are used.
However, this procedure can not always be applied. An example of this is the noindex meta tag . Although this prevents the inclusion in the Google index, but does not cause a back link from this page will not be counted.
Link Method
The conventional method for generating a hyperlink is the use of <a> tag which carries the destination URL as its value href attribute. Using this method ensures the full value of this backlinks. So this link is one, it must not, however, with the nofollow attribute to be equipped.
There are also other methods to realize a hyperlink. This includes, for example, a forwarding command using the JavaScript window.location or the link in a HTML image map . Google also keeps track of these types of "links", but it is not known whether this also be interpreted as equivalent to <a> tags.
Some websites use a special script for masking outbound links. In each case, reference to a side internal address where a parameter (for example, the URL of the target page) is passed. The script now uses a redirect (HTTP status code 3xx) to pass ultimately to the desired page. As already 301 redirect was explained, these redirects are always subject to some penalty, which would reduce the value of such backlinks.
Anchor Text
The anchor text has also been introduced and explained. For search engines, it represents a hyperlinked page for additional information and should consist of the desired target word.
In general, one assumes, however, that in this area there is a filter of Google is to oversee the distribution of different anchor texts. The basic idea behind this filter is the recognition of an unnatural linking , which in turn could indicate a manipulation. For practical use this means that the anchor texts vary to some extent should be. Thus, the complete domain name is often used as the link text for example. Another example is the use of the full name in which to leave comments on blog posts.
The use of the Domain Names is yet another reason makes sense, because the so-called Fire update in September 2009 (as Vince update known) has increased the visibility of brands. With reference to the set link text as brands are often linked with their name. More information and facts to be found at Media donis: The Case of the fire.
Link Title
The title attribute is one of the so-called Universal HTML attributes and can be used as it is in almost all HTML tags. On self html the title attribute is described as follows:
[The title attribute] allows to equip HTML elements with relevant comments or meta-information. The commenting text is standardly by the browser in a small window ("tool tip") or displayed in the status bar when the user moves the mouse over the display area of the HTML element.
With the help of this attribute is a back link that is in addition to more information on the linked page will be given to the anchor text. Although there is no official statement by Google that the text contained in this attribute has an effect on the ranking, but it would be only logical that this would be the case.
Content relevance
The original idea of the Random Surfer model was the adoption of a user navigates through hyperlinks from a web page to the next and can thereby determine the coincidence which link is followed in practice. The Reasonable Surfer extends this model to a probability component that links certain weighted more heavily than others. The logical extension of this idea is an appreciation of backlinks that are in a context relevant to the topic and provide a user, for example, further information is available. That Google is able to establish relationships between different concepts, show various services such as the display of related terms, which is exemplified in the figure below. Even if this is likely to be a stochastic model, it is at least the facility having Google, in this context.
Link placement
Also from the Reasonable Surfer model shows that the placement of backlinks to a website (header, content, footer, etc.) has an impact on its weight.
Number of external and internal links
The number of internal and external links which are on one side, reduce the value of each link . This is a direct result of the Page Rank algorithm. Google itself called as a guide max. 100 links per page. This figure is, however, historically and is mainly due to the fact that Google has indexed only 100kb at the beginning of a website.
Generally, it is believed that internal links in this context not as strong as External fall into the weight , as it is common in many websites, for example, a navigation display on each page, so that almost always are some internal links on each page . However, a crucial link page, it is still a positive criterion if this as few outbound links.
