WordPress sites are great at holding content. Got some words and pictures you want to show the world? WordPress is a great tool for that job. Probably the best. But by default it only has two types of content: Posts and Pages. These are great, by many people have many other types of content: client testimonials, documentation of a project, past projects listings and more. Posts and Pages can be made to house these sorts of items, but there’s a better option: WordPress custom post types.