iGoogle (formerly Google Personalized Homepage), a service of Google, is a customizable Ajax-based startpage or personal web portal (much like Netvibes, Pageflakes, My Yahoo!, and Windows Live Personalized Experience). Google originally launched the service in May 2005. Its features include the capability to add web feeds a "Google Personalized Homepage" to "iGoogle". As of 17 October 2007 (2007 -10-17)^[update] Google had made the service available in many localized versions in 42 languages, and in over 70 country domain-names. In February 2007, 7.1 million people used iGoogle. In April 2008, 20% of all visits to Google's homepage used iGoogle.

Google created the left sidebar feature to compress the size of the gadgets users want to have and to accommodate young chat users who are not interested in features such as news, weather, sports, financial markets, etc.

iGoogle gadgets interact with the user and utilize the Google Gadgets API. Some gadgets developed for Google Desktop can also be used within iGoogle. The Google Gadgets API is public and allows anyone to develop a gadget for any need.