What is a tag?
Tags are keywords or short phrases that are used to help people find similar content.
For example, if you add a picture of your pet Poodle to Natuba you might add the the following tags: poodles, pets, dogs, standard poodle. Since tags are also links, any other Photo tagged with "poodles" will link to your Photo. Just look at all the dogs that have been tagged!
To get started with tags, you may also want to read about adding tags on Natuba.