KML is an XML-based format for storing geographic data and associated content. KML files have either a .kml extension, or a .kmz extension for compressed KML files. Refer to the following web help document, What is KML?, for more information about KML.
Instructions provided describe how to convert shapefiles to a KML file.
Click the Geoprocessing tab, and click ArcToolbox to open the ArcToolbox window.
Expand Conversion Tools.
Expand To KML.
To open the conversion tool window, double-click Layer To KML for an individual shapefile, or double-click Map To KML for compressed KML files.
Under the Layer drop-down box, select the desired shapefile, or drag and drop the desired shapefile into the box.