Kinds of Widget

Widgets are interactive virtual tools that provide single-purpose services such as showing the user the latest news, the current weather, the time, a calendar, a dictionary, a map program, a calculator, desktop notes, photo viewers, or even a language translator, among other things. Examples of widget engines include:

• Dashboard widgets of Apple Macintosh
• Microsoft gadgets in Windows Vista and in the Windows Live system
• Plasmoids are widgets in Plasma the workspace for the KDE desktop environment.
• gDesklets,Adesklets,Screenlets of Linux systems.
• Portlets in Google Desktop
• Yahoo! Widgets
• Klips in Klipfolio
• Mobile widgets webwag,Zumobi, Mywidz, Plusmo and WidSets are a few examples
• Adobe AIR

Originally, desk accessories were developed to provide a small degree of multitasking, but when real multitasking OSes became available, these were replaced by normal applications.

Early examples of widgets were desk accessories on Mac OS. The Active Desktop system, developed by Microsoft, was the first system to enable desktop objects with internet access.^{[verification needed]} Widgets resemble the tiny freeware apps that were developed by enthusiasts during the 80s.

On 9 November 2006, the Web Application Formats Working Group in W3C released the first public working draft of Widgets 1.0.^[1] Widget is on its way to standardization.

Mobile widgets

Most mobile widgets are like desktop widgets, but for a mobile phone. Mobile widgets can maximize screen space use and may be especially useful in placing live data-rich applications on the device home-screen/"phone-top". Several J2ME-based mobile widget engines exist including Bling Software, BluePulse, Zumobi, Mywidz, Plusmo, WidSets, Webwag^[2], WidX, Bicon. However the lack of standards-based APIs for Java to control the mobile device home-screen makes it harder for these engines to expose widgets on the phone-top.

Several AJAX-based native widget platforms are also available for mobile devices including Access' NetFront, Openwave's MIDAS and Opera's Opera Platform.

The growing pervasiveness of mobile widgets is easily understood. While widgets are a convenience in the online world,they can be looked at as near-essential in the mobile world. The reason: the mobile device is small and the interface is often challenging. Wading through large amounts of information in a mobile environment isn't just a nuisance; it's a near impossibility.

One of the biggest challenges of widget development is writing multiple sets of computer code so that a widget will be compatible with multiple operating systems and types of devices.

Companies considering new mobile widgets should evaluate and then deploy applications according to four criteria: the business model, distribution model, server-side application framework and the run-time environment.

Web widgets

Web browsers can also be used as widget engine infrastructures. The web is an environment well suited to distribution of widgets, as it doesn't require explicit interaction from the user to install new code snippets.

Web widgets have unleashed some commercial interest, due their perceived potential as a marketing channel, mainly because they provide interactivity and viral distribution through social networks. The first known web widget, Trivia Blitz, was introduced in 1997. It was a game applet offered by Uproar.com (the leading online game company from 2000 - 2001) that appeared on over 35,000 websites ranging from Geocities personal pages to CNN and Tower Records. When Uproar.com was acquired by Vivendi Universal in 2001, the widget was discontinued.

Information flow of Desktop Widgets

A desktop widget is a small footprint application, which resides on the user’s desktop using a small desktop space and computer resources, such as the HDD and RAM. Its purpose is to provide relevant information to the user in a non-intrusive manner and using few resources. Basically, desktop widgets enable the user to view on demand, capsuled information from predetermined data sources. Ideally, a desktop widget must present personalized content, based on the user’s preferences. It is supposed to beam the most important information that a user requires on a day to day basis. Most of the desktop widgets are available as free downloads from the vendors’ Web sites.