Sharepoint Forum - Q & A : what is custom content type?

Q) what is custom content type? and what for is it good?

A) Assume you know about the Content Type basically a content type is a reusable collection of settings that are applied to a certain category of content. Content types enable the management of the metadata and behaviors of a document or item type in a centralized, reusable way. Also used for content classification (Taxonomy).Above text taken from the following links and it also discuss about creating Custom Content Type
Check the below PDF for more information about the Custom Content Types
Creating and Using Content Types in Windows SharePoint Services 3.0 by ted pattsion
This blog discussion about creating Content Type and association with a workflowContent Types: Part 2 - Creation and Association of Workflows and Document Templates (Republish)and a very good discussion about Content Type can be found here