A single web site could contain many types of content, such as informational pages, news items, polls, blog posts, real estate listings, etc. In Drupal, each item of content is called a node, and each node belongs to a single content type, which defines various default settings for nodes of that type, such as whether the node is published automatically and whether comments are permitted. (Note that in previous versions of Drupal, content types were known as node types.)
When you first install Drupal with the default installation profile (in contrast to the minimal installation profile), you will have two content types defined: "Article" and "Basic page". When you enable other core and contributed modules (by visiting Modules), you will find that you have other content types available; you can also create your own content types (see below).
Content types in Drupal 7 and 8