how does a website automatically create meta tags and keywords and such

how does a website automatically create meta tags and keywords and such

References

Reference NO 1

http://en.wikipedia.org/wiki/Meta_element

Reference NO 2

http://www.hermetic.ch/kwg/kwg.htm

Reference NO 3

http://www.scrubtheweb.com/abs/builder.html

Reference NO 4

http://codex.wordpress.org/Meta_Tags_in_WordPress

Reference NO 5

http://docs.joomla.org/Making_your_site_Search_Engine_Friendly

Reference NO 6

http://www.thesitewizard.com/dreamweaver/meta-tags-editable-region-template.shtml

Reference NO 7

http://help.yahoo.com/webhosting/promote/promote-03.html

Reference NO 8

http://invisiblegold.com/support/articles/metatagsvskeywords/