SEO: Search Engine Optimization, Glossary of terms
White Hat SEOSearch engine Optimization tech-nicks which uses legitimate method and focus on improved user experience for better ranking of pages to increase traffic.
This type of page optimization focus on long term search engine ranking by providing good and useful content for the visitors.
Opposite to this is black hat Optimization.
Panda Algorithm Update of GoogleThis is one of the main update of google algorithm, started around Feb 25th 2011 mainly for USA sites and globally on April 11th 2011. Its effect was visible by 13th April. As per google it affected 12% of the queries.
After this there were many small and big updates of Panda was rolled out by google affecting many sites.
As per google official blog on this update the main purpose was to improve ranking of high quality sites.
EMD: Exact Match DomainDomains names are used with specific keywords to target for better ranking in Search pages. These keyword stuffed domain names are some time targeted in algorithm updates.
There is some observations that Google Penguin update targets these EMDs
Penguin Algorithm update of googleThis algo update was announced on 24th April 2012 and its effect was vissible around 27th May. As per google this has affected 3 % of search queries.
This update is targeted towards sites engaged in ' black hat webspam' methods to increase ranking in search results.
More details on Penguin update from google
Black Hat SeoAlos know as Black Hat Webspam, are techniques used to take advantage of loopholes of present ranking algorithm of search engines without adding any value to improve user experience or quality of site etc.
These are not in long term interest and likely to fail in long run with improvment and changes in search ranking algo.
Read more on Black Hat Webspam here.
QDF : Query deserves Freshness Freshness of the content does not matter for all type of contents. Some news , events , sports etc deserves fresh content but in other hand there are some ever green contents like evolution of earth, historical events and past data. So it depends on the query which will return fresh or updated content or aver green content.
Check your queries for which you are getting traffic requires freshness or not. If it is not required then no need to update your content.