ArcWeb Services was a GIS product offered by ESRI

ESRI

Esri is a software development and services company providing Geographic Information System software and geodatabase management applications. The headquarters of Esri is in Redlands, California....

 to provide Web-oriented spatial data services. ArcWeb Services is a Hosted GIS that provides geographic web services (W3C/SOAP

SOAP

SOAP, originally defined as Simple Object Access Protocol, is a protocol specification for exchanging structured information in the implementation of Web Services in computer networks...

 and others) to web browsers and other Internet-enabled technology.

ArcWeb Services addresses the needs of organizations that wish to use geographic data and GIS functionality on a services basis, that is, without necessarily creating an extensive in-house GIS infrastructure. ArcWeb Services is composed of APIs, geographic services accessed through the APIs, and hosted data.

Esri discontinued ArcWeb on June 30, 2009 and has migrated to ArcGIS Online.

APIs

include

• JavaScript
  JavaScript
  JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles....
  
  
• REST
• SOAP
  SOAP
  SOAP, originally defined as Simple Object Access Protocol, is a protocol specification for exchanging structured information in the implementation of Web Services in computer networks...
  
  
• OpenLS
• Java 2 Micro Edition (Mobile Toolkit)

Geographic Services

include

• Address Finder - provide an address, get a geographic location
• Map Image - provide a geographic window, get a map
• Report - provide a location, get a printed report of data at the location (e.g., demographic)
• Route Finder - provide start and end locations, get a route between them
• Place Finder - provide a place name, get a location
• Wireless Location - query a device, get its location

Hosted data

include

• Business Information
• Demographics
• Geographic Boundaries & Landmarks
• Imagery
• Physical Environment
• Transportation
• Weather

ArcWeb Services is typically used by organizations that want to use hosted GIS data. ArcGIS Server

ArcGIS Server

ArcGIS Server is the core server geographic information system software made by Esri. ArcGIS Server is used for creating and managing GIS Web services, applications, and data...

, another Esri product, is typically used by organizations that want to distribute their own GIS data.