You can give your caches, logs, images and swaggies a "tag", which is like a keyword or category label. Tags help you find items which have something in common. You can assign as many tags as you wish to each object.
It is best to be concise when setting a tag for an object. For instance: If you wish to highlight the fact that a cache is at a waterfall with a lookout and great views you could tag it with:waterfall,lookout,view
Common words and phrases like 'if' 'and' 'for' etc. are not saved, as well as punctuation and special characters.
You can set multiple tags for an object by seperating them with a comma.
Tags can have spaces within them, so kid friendly,playground would be 2 tags, one called kid friendly one called playground.
You can search on tags by visiting this link