What is the difference between tags and categories in WordPress?
“Categories are meant for broad grouping of your posts. Think of these as general topics or the table of contents for your WordPress site. … Tags are meant to describe specific details of your posts.”
Here is what the people at WordPress have to say about the topic:
Categories and tags are very similar. They both allow you to organize content that can then be used in a variety of ways. However there are a few differences.
Categories are best used for broad groupings of topics. For example, if you’re creating a site that reviews media, you might use categories such as Books or Film or TV.
Tags are much more specific topics that you want to use to associate related content. For example if you were creating a site that reviews media, you might want to use tags such as science fiction or horror or action adventure.
A lot of this, tags and categories, has to do with Search Engine Optimization, often shortened to SEO.
What is SEO?
More to come on that, when I get a chance.