Black Hat SEO - What exactly does this phrase mean?
This is Unethical SEO.
Search Engine Optimization techniques and methods are employs which fall outside of the guidelines issued by the Major Search Engines such as Google, Yahoo and MSN. Implementation of this type of Search Engine Optimization may provide short term gains for your site(s).
(http://www.oyster-web.co.uk/glossary.htm)
Search engines like google will not ban your website for using some of these techniques, but you can expect severe penalty by reducing your rank in the search results. That means black hat SEO practices will provide short-term benefits in terms of rankings till they discover your website for utilizing those Spam techniques.
If you feel that your site contains any of the following techniques, consider evaluating your website by removing those Spam techniques.
1) Hidden text: It is the text that visitors cannot be seen while visiting your website. This is by putting keywords in white text on white background or in other way by using CSS
2) Doorway pages: Pages with keywords filled but the user will never get this page. This is for basically attracting search engine spiders.
3) Comments tag: This tag allows you to hide contents.
4) Image ALT tags: beware of using 1x1 pixel image with keyword stuffing in ALT attributes.
5) Keyword stuffing in Meta tags: keyword stuffing in meta keyword and description tags
6) Keyword stuffing in Title tag: beware of using keyword stuffing in this tag. eg: <title>kerala, kerala, kerala tourism, backwaters, kerala arts, kerala, kerala tour, kerala package tour, tour kerala</title>
7) Small text: Use of font size 1 or 1px
8) Cloaking: server re-directs a visitor to one page and a search engine spider to another page. Beware of using this techniquest, google will permanantly bann your website.
9) Mirror sites: duplicated sites or duplicated page content
10) Excessive cross-linking of related sites
11) Linking schemes design to improve Web site rankings
12) Links to penalized sites or "bad neighborhoods"
Read the following guidelines that major search engines provided in their website: