IOC, one of the most buzzing words in IT. I will describe its clear cut meaning with example in this article.

Formal Definition: IOC is an aspect of some software architecture designs in which the flow of control of a system is inverted in comparison to traditional programming.

Before discussing further, let me give you one example,

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An enterprise portal, also known as an enterprise information portal (EIP) or corporate portal, is a framework for integrating information, people and processes across organizational boundaries. It provides a secure unified access point, often in the form of a web-based user interface, and is designed to aggregate and personalize information through application-specific portlets. One hallmark of enterprise portals is the de-centralized content contribution and content management, which keeps the information always updated.

The mid-1990s saw the advent of public Web portals like AltaVista, AOL, Excite, and Yahoo!. These sites provided a key set of features (e.g., news, e-mail, weather, stock quotes, and search) that were often presented in self-contained boxes or portlets. Before long, enterprises of all sizes began to see a need for a similar starting place for their variety of internal repositories and applications, many of which were migrating to Web-based technologies.

By the late 1990s, software vendors began to produce prepackaged enterprise portals. These software packages would be toolkits for enterprises to quickly develop and deploy their own customized enterprise portal. (more…)