Tag is a very common word used in the blogosphere, but what does it really mean and how (or why) do you use it?
My definition of tags:
Tags are descriptive keywords used to label something.
But here’s the “correct” definition according to Wikipedia:
A tag is a (relevant) keyword or term associated with or assigned to a piece [...]

Did you know what tags are for. I bet some of you have wondered what they actually do and whether they are absolutely necessary when posting blog posts. Actually, tags have a great functionality built into their use.
Tags and widgets
If you have a widgetized WordPress blog, you would have noticed that there is also a [...]

Can’t remember how long it’s been since I bought something from Amazon, or even browsed their listings, so I can’t really say when they started to implement this:

Yes, Amazon has their own internal tagging system, where user can now tag all items with their own tags, and the top tags displayed in all their product [...]