信息来源: http://en.wikipedia.org/wiki/Plugin

In computing, a plug-in (also: plugin, addin, add-in, addon, add-on, snap-in or snapin; but see also extension) consists of a computer program that interacts with a host application (a web browser or an email client, for example) to provide a certain, usually very specific, function "on demand". Often, add-on is considered the general term comprising plugins, extensions, and themes as subcategories.

Applications support plugins for many reasons. Some of the main reasons include:

• to enable third-party developers to create capabilities to extend an application
• to support features yet unforeseen
• to reduce the size of an application
• to separate source code from an application because of incompatible software licenses.

Examples of applications and their plug-ins include(还有很多):

• Microsoft Office uses plug-ins (better known as add-ins) to extend the capabilities of its application by adding custom commands and specialized features
• Rockbox, a firmware for digital audio players, can use plug-ins, for example: play games, use the text editor
• Email clients use plug-ins to decrypt and encrypt email (Pretty Good Privacy) or to send oversized email attachments (Globalscape Mail Express)
• Graphics software use plug-ins to support file formats and process images (Adobe Photoshop)
• Media players use plug-ins to support file formats and apply filters (foobar2000, GStreamer, Quintessential, VST, Winamp, XMMS)
• Packet sniffers use plug-ins to decode packet formats (OmniPeek)
• Remote sensing applications use plug-ins to process data from different sensor types (Opticks)
• Software development environments use plug-ins to support programming languages (Eclipse, jEdit, MonoDevelop)
• Web browsers use plug-ins to play video and presentation formats (Flash, QuickTime, Microsoft Silverlight, 3DMLW)
• Some digital mixing consoles allow plug-ins to extend features such as reverberation effects, equalization and compression.
• Some Web content management systems use plug-ins to increase functionality.

我加个Eclipse(弹性很好)地址：

http://www.eclipse.org/

http://www.eclipseplugincentral.com/

Contents 1 Mechanism 2 Plug-ins and extensions 3 History 4 Plug-in frameworks 4.1 C++ 4.2 Delphi 4.3 Java 4.4 Python 4.5 .NET 5 References 6 See also

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