Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. RD (Ruby Document) is a lightweight markup language for writing Ruby-related documents. It can be embedded in Ruby source code. RD is a traditional format. In modern Ruby, developers tend to write documents in RDoc instead of RD. RD was used for many documentation in the Ruby world. The documentation for Ruby itself was originally written in RD. In 2002, the documenation was re-written in RDoc format. The Japanese version of the Ruby Reference Manual is still written in RD. RD is easy to read in the raw. It is designed to read or write by hand. But, in most cases, end-users read it after it has been converted into man pages or HTML pages.

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