ArcToolbox

ArcToolbox provides an organized collection of tools used for GIS analysis, data management, and data conversion.

Inside ArcToolbox, tools are organized into toolboxes and toolsets.

ArcToolbox is accessible from both ArcMap and ArcCatalog. The number of tools you have depends on your ArcGIS license: ArcView supports a core set of GIS tools, ArcEditor adds more, and ArcInfo provides the most comprehensive set of tools.