Good question. I think they are pretty much the same to be honest, just 2 different words, that's my opinion.
keywords means the words which used to optimize the website eg: website designer - this is keyword or key phase. Tags is the HTML code word, like title tags <title></title> this HTML code is called tags, if you are done the title tags, description tags and keyword tags for any page, then you say that SEO tags for that page is done....
same thing, some guru just use word tag, more easy for normal people to understand. tag is a verb sometimes
Tag and keyword are almost likely but a small different between them. Both of them are using for describe the relative keywords in the page. However, tags was originated in blog format to help use filter out only related topics tagged with specific keyword "tag" while keywords in meta keywords cannot help you doing this. I think that is all the different between them anyway.
i am not a big expert /.... but what i now on tags is if u use a alt tag for a picture then the picture will get indexed and comes front in Google pictures.... tags are mostly for other than normal searches... maybe for pictures, maps and many others ...
Dinesh you are saying about image - alt tag. But in this post there is a question about difference between keywords and tags... They are not same, i think keywords are for search engines and tags work like another type of link HTML code. If anyone can describe it in brief then please, I am also waiting for good answer
but what i now on tags is if u use a alt tag for a picture then the picture will get indexed and comes front in Google pictures.... tags are mostly for other than normal searches... maybe for pictures, maps and many others ...
Tags mainly came from the blog format to help use filter out only related topics tagged, similar to categories. While keywords in meta keywords helps you in SEO in gaining more tragetted traffic from search engines.