arc42 is a template for software architecture documentation and communication, answering the following two questions in a pragmatic way:

• What should you document/communicate about your architecture?
• How should you document/communicate?

In addition, arc42 proposes many pragmatical, efficient, economical simple solutions to explain software architectures.

arc42 has been widely used in many organizations since 2005.

It has been developed by Dr. Gernot Starke and Dr. Peter Hruschka. arc42 is maintained at Github.