A content type (or "node type") is simply a data submission form. Content types are used to categorize groups of content that have similar elements, or are expected to perform in a particular fashion on a dynamic website.
Drupal comes with two standard content types, different modules that are added to Drupal may provide their own content types, and a permitted user can also create custom ones as well. The content types that you will find in OSU Drupal 6 are as follows:
The two basic content types that are part of Drupal's core distribution are the Page content type and the Story content type.
In the OSU Drupal 6 distribution, there isn't much of a difference between Page and Story in terms of format. Both are very generic forms that have similar fields and both provide the same default options found on all node types in Drupal. The only difference between the two is that Page is set to automatically publish when you click the Save button and Story is set to automatically save as a draft when you save.
The Page content type is suggested for static content - this is content that doesn't change very often. Story is suggested for more dynamic and engaging content such as a news story, press release, or human interest story. The reason for two similar, yet differently named content types, is to provide the user with variation in node types - this probably doesn't mean too much to you yet, but when you move into more advanced subjects such as using Views, having varying node types provides a great deal of flexibility for site builders.
For now we'll take a look at Page, and keep in mind that Story is almost exactly like it. If a module has its own content type, instructions for that content type's use will be included in the information about the module.