Now our site want to use "tag", And our site is an B2C website,so we sale electronics gadgets online, but i do not know how to do it,and i do not know what is the effect of "tag", anyone can tell me?Or could you show me serveal sites had used this function?
Thanks.

Now our site want to use "tag", And our site is an B2C website,so we sale electronics gadgets online, but i do not know how to do it,and i do not know what is the effect of "tag", anyone can tell me?Or could you show me serveal sites had used this function?
Thanks.

Taging is a way to categorize content in a better way(Search engine friendly) way. Have a look at this http://en.wikipedia.org/wiki/Tag_%28metadata%29

To implement you basically need to have a Tag list table where each tag will map to some device. One device can have multiple tags.

Have a look at my blog at http://classictutorials.com
Click on "Tag" tab on right hand side. I have tagged my posts with Tags and when i send my sitemap.xml to search engines they exactly know which post has what tag