Tags purpose ???

just a quick question.
Can someone explain me what is the purpose of tags. I have seen these tag clouds and i havent got a clue what they are for. I have done one for my website too and picked random words to tag pages.
Is there any specific way of picking tags and what they actually do to my website ??

According to me Meta tags are HTML tags that provides data to search engines about information present on a webpage and help in ranking the importance and relevance of a particular webpage. Without Meta tags your site could not be find by search engine. Meta data tag must be one of the most important element of on page optimization. These are originally designed to provide webmasters with a way to assist search engines know about their site. It also helps to increase visibility in different search engines.

so does met tags suppose to be my keyowords or just words describing content on my page ?

Hi
Yes you need to specify first what kind of tags your are referring to here.
S.

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