This document provides an overview of OpenStack Murano, an application catalog service for OpenStack. It discusses why Murano is used, what Murano is, the Murano architecture including key components, how to use Murano through different personas like end users and application providers, and how to install, configure, design application catalogs, and troubleshoot Murano. The document aims to explain all aspects of working with the Murano application catalog service on OpenStack.