What is a tag?

[Dazler]

On the right hand side of my home page there is an empty field window called "Tags"

Please, what is a tag and what purpose do tags serve? I'd be curious to know what they are and how they work. What purpose do they serve?

Thank you for any information in anticipation.

[LoveAngeL Lyre]

Hello Dazler. A tag is a single keyword or a phrase that describes the topic, theme, or subject of the post.

You and other community members can add tags at the Member rank. For more details please check out the following link:

http://community.secondlife.com/t5/help/faqpage/faq-category-id/tagging#tagging

So this empty field window shows the tags each user  has already added.

[Rolig Loon]

LoveAngel has the right answer about what tags are.  To answer the rest of your question, though, I can't see that anyone is using tags much. They seem like a kind of pointless add-on.