ArcGIS for Desktop is part of Esri’s family product which includes complete professional GIS applications to support of various GIS tasks. The tasks include geographic information sharing, image and geodata management, analysis, data compilation, and mapping. Professionals can organize and map data using ArcGIS for Desktop to present tabular data in new ways to assist informed and insightful decision making. The raw data can be turned into productive information as users measure results, develop mapping solutions, analyze business data, allocate resources, and manage assets. The software also enables users to rank results, understand change, make predictions, and identify trends. ArcGIS for Desktop was previously referred to as ArcGIS Desktop. The ArcGIS suite has three license levels, ArcGIS for Desktop Basic, ArcGIS for Desktop Standard, and ArcGIS for Desktop Advanced. Every license provides a different functionality. ArcGIS for Desktop 10.2 is available for users as of April 2014Cite error: Invalid <,ref>, tag, invalid names, e.g. too many. Users can enjoy several enhancements including : A set of tools is included for simple data cleanup and input as well as for sophisticated design and versioning. ArcReader is a free desktop mapping application, ArcReader allows users to print, explore, and view globes and maps. High-quality interactive maps developed using high-level ArcGIS for Desktop product are available for viewing for anyone with ArcReader. Users can do the following with ArcReader: ArcGIS Web Mapping APIs  can help users to embed and develop interactive web maps. Users are able to do the following with ArcGIS Web Mapping APIs: ArcGIS Online is a system for managing and sharing GIS content, maps, and apps. This application supports many different kinds of geographic information through an open information model. This application can be used by anyone, as well as content published by Esri, ArcGIS users, and other authoritative data providers. ArcGIS for Desktop offers optional extensions  such as ArcGIS 3D Analyst, ArcGIS Publisher, ArcGIS Editor for OpenStreetMap, and ArcGIS for Aviation to enhance users’ systems. The extensions can be used to: If the ArcGIS for Desktop setup does not find either Python 2.7.x or Numerical Python (NumPy) 1.6.x installed on the target computer, Python 2.7.3 and Numerical Python 1.6.1 will be installed during a complete installation of ArcGIS 10.2. Python 2.7.5 and Numerical Python 1.7.1 will be installed during a complete installation of ArcGIS 10.2.1. Source.