[SaF] how search engines work

[sajeev]

Sir/M'm,
Somebody told me about the 'META  KEYWORD=' tags in HTML and according to
him these tags are for search engines to find our site.  In search engines
like yahoo or altavista, we have to submit our site into their database if
we want to be listed. Is there search engines that depend on these 'META
KEYWORD=' tags for searching? If yes, I shall be grateful to know how.
Thank you,
sajeev.