SEO (16) Inbound links
For Google, inbound links help determine the PageRank of a website. Without any inbound links, a website is practically invisible to the search engine. One way for the search engine spider to index a website is by following inbound links from another indexed website. The alternative is to manually submit the website to the search engine spider’s crawling list. Though manual submission is encouraged, there is never a guarantee that the website will be indexed. On the other hand if there are inbound links from other sites, it is more predictable that the website will be indexed.
Inbound links from the following sources help in improving ranking of a web page
1. All major and local directories; Yahoo, DMOZ, LookSmart, trade, business and industry related directories
2. Suppliers, happy customers, sister companies and Partners
3. Websites which provide accompanying services
e.g. Inbound links from web hosting companies for a site selling website templates
4. Related websites but not competing websites
e.g. Websites that provide tutorials about web design and modification of website templates
5. Competing websites
Not all inbound links have the same weightage. Links from authoritative industry sources count more towards improving page ranks than links from a small private website. Some inbound links may have a negative effect on the PageRank. These are:
1. Links from FFA (Free for all) link pages
2. Link farms
Link farming is the process of organized exchanging of unrelated links between websites.
3. Links from doorway pages
Doorway pages are web pages created with the intent of inflating the inbound links of a website. These pages are created with the sole purpose of serving search engine spiders with optimized content which may boost the ranking of the webpage.
4. Links from discussion forms
Discussion forums can be maliciously used to inflate the inbound links to a website. Given a good but unmoderated message board, spammers may include messages to their spam pages as part of seemingly innocent messages they post. In a moderated message board, spammers post valid messages with links to their websites in their signatures.
Most search engines penalize websites which employ malicious techniques to inflate link popularity to the extent of removing the website from the index.
source:SEARCH ENGINE OPTIMIZATION AND MARKETING by Binoy Varghese page 33-35
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