Content Input Formats
Each content piece you create will have "input type" options available. Each of the input formats available by default will be explained below:

- Filtered HTML is the default, it automates much of the HTML creation by automatically linking web addresses and email addresses, retaining line breaks by converting them to HTML line breaks, and allowing limited HTML to be manually added.
- Full HTML allows the use of any HTML code your choose to use but will still automatically parse URL's and email addresses into links.
- TinyMCE Rich Text is the option that will present you with the TinyMCE rich text editor, which is similar to a word processor to help you create the document you want without needing to know HTML at all.
- FCK Editor Rich Text is the option that will present you with the FCK Editor, which, like TinyMCE, is similar to a word processor to help you create the document you want without needing to know HTML at all.
Each input format, whether rich text editor or not, has a set of rules they run under, whether or not to auto-link URL and email addresses, whether or not to retain line breaks and things like that. You can create any addition input formats if you choose, though I would have to work pretty hard to think of a reason another input type would be necessary.
