custom post types – The Difference Between Categories and Tags and Taxonomies and Terms


I’ve got a custom post type ‘articles’ and I’ve added a custom taxonomy ‘articles_categories’ which has its own terms.

I was under the impression you can’t have categories and tags on custom post types? But I can’t see how Taxonomies and Terms are the same? And if you can have categories and tags on custom post types what is the reasoning for using custom Taxonomies? It’s all very confusing.

Could someone explain the context of taxonomies and why can’t you use categories and tags on custom post types?

Many thanks in advance