Link Popularity history:

To gain a better understanding of link popularity it is useful to know why it became so crucial for search engine rankings. In the past a web page's ranking was determined, amongst other factors, by the number of keyword occurences within 'on-page' elements i.e. in page text, META tags, title tag. When web developers learned that they could trick a search engine to return their web pages by cramming keywords into their pages the search engines had to get a bit smarter. They were using 'on-page' elements to determine relevance so it was only natural that they would look to elements out of direct control of the web page creator i.e. 'off-page' elements. Search engines made the assumption that the greater the number of links from other sites pointing to a web site, the more popular the web site is and therefore a more quality resource. This worked nicely in theory but in practice it was also to be abused.

Web site owners figured out many ways to get links pointing to their web sites one example of which was through the use of link farms, pages the contained nothing more than a collection of links, Quantity of links was being abused so the search engines made use of the old saying "quality not quantity" and began to assign a quality factor to each of the links pointing to a web site. Now web sites that had a higher number of high quality links were looked upon favourably by the search engines. Building link popularity became a science in itself and today is still the most time-consuming and frustrating activity for a search engine optimizer.

Negative Keyword

Negative Keyword is a term referenced by Google AdWords and is a form of keyword matching. This means that an advertiser can specify search terms that they do not want their ad to be associated with.

For example, if you add the negative keyword "-nike" to the keyword "running shoes", the ad will not be displayed if a person searches upon the term "nike running shoes".

Negative keyword matching ensures that only qualified traffic is clicking upon advertising.

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Hidden Text

This is text that can not be seen in a normal browser. Some websites use hidden text to trick search engine spiders. Hidden text can contain high density keywords that make no sense to a normal person but can make search engines believe a site is about a certain subject. Hidden text can be implemented in many ways: beneath images, in white on a white background, within certain code-tags or just in a very, very, small font. It is therefore hard for search engine spiders to detect this kind of fraud, but they are becoming increasingly better at it.

Robots.txt

Robots.txt is a text (not html) file you put on your site to tell search robots which pages you would like them not to visit. Robots.txt is by no means mandatory for search engines but generally search engines obey what they are asked not to do. It is important to clarify that robots.txt is not a way from preventing search engines from crawling your site (i.e. it is not a firewall, or a kind of password protection) and the fact that you put a robots.txt file is something like putting a note “Please, do not enter” on an unlocked door – e.g. you cannot prevent thieves from coming in but the good guys will not open to door and enter. That is why we say that if you have really sen sitive data, it is too naïve to rely on robots.txt to protect it from being indexed and displayed in search results.

The location of robots.txt is very important. It must be in the main directory because otherwise user agents (search engines) will not be able to find it – they do not search the whole site for a file named robots.txt. Instead, they look first in the main directory (i.e. http://mydomain.com/robots.txt) and if they don't find it there, they simply assume that this site does not have a robots.txt file and therefore they index everything they find along the way. So, if you don't put robots.txt in the right place, do not be surprised that search engines index your whole site.

The concept and structure of robots.txt has been developed more than a decade ago and if you are interested to learn more about it, visit http://www.robotstxt.org/ or you can go straight to the Standard for Robot Exclusion because in this article we will deal only with the most important aspects of a robots.txt file. Next we will continue with the structure a robots.txt file.

BackLinks

Backlinks are incoming links to a website or web page. Backlinks enable you to keep track of other pages on the web that link to your website. The number of backlinks is an indication of the popularity or importance of that website or page. In basic link terminology, a backlink is any link received by a website (web page, directory, website, or top level domain) from another website. Backlinks are also called incoming links, inbound links, inlinks, and inward links.

Why backlinks are so important?

Search Engine Results. This is perfect and a very small answer to this question. When search engines calculate the relevance of a site to a keyword, they consider the number of QUALITY inbound links (backlinks) to that site. More backlinks to your website, higher your search engine result position. Backlinks hold an important place in the field of Search Engine Optimization. It is one of several criteria considered by search engines when indexing and driving traffic to your site. Link Popularity and number of backlinks are directly proportional to each other. The more the backlinks, the better the popularity of a site. Backlinks are very crucial for Search Engine Optimization and Ranking. Some Search Engines, especially Google gives a lot of importance to the number of backlinks a website has. Google considers website more credible that others on the basis of number of quality backlinks it has and considers them more accurate and relevant in their results pages for a search queries.

What is quality backlinks and relevant backlinks?

Please note that quality backlinks and relevant backlinks are two very important considerations for SERP. A backlink from a site that has quality content is reffered as quality backlinks or relevant backlinks. Relevant backlinks will hold you in a much better stead than a back link coming from a poorly designed or optimized site Or from a site that has nothing to do with the theme of your site. The major search engines such as google see incoming links from relevant sites, and give them more rank compared a backlink from an unrelated site. For example, if you have a website about web design products, your link strategy should target web design related sites.