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Dataphone Modem

At&T Dataphone was the first commercial modem made for converting digital computer data at analog signals for transmission across long distance networks. A modem (modulator-demodulator) is a network hardware device.

Hybrid Cloud

A hybrid cloud joins together a public and private cloud with an encrypted connection and technology that makes data portable. The key here is that both clouds remain separate, independent entities while also having one or more touch points in common.

public cloud is one based on the standard cloud computing model, in which a service provider makes resources, such as applications and storage, available to the general public over the Internet. Examples of public clouds include Amazon Elastic Compute Cloud (EC2), IBM’s Blue Cloud, Sun Cloud, Google AppEngine and Windows Azure Services Platform. Whereas a private cloud is a particular model of cloud computing that involves a distinct and secure cloud-based environment in which only the specified client can operate.

Data Flow Diagram 

A data flow diagram (DFD) maps out the flow of information for any process or system. It uses defined symbols like rectangles, circles and arrows, plus short text labels, to show data inputs, outputs, storage points and the routes between each destination.

flowchart is a visual representation of the sequence of steps and decisions needed to perform a process. Each step in the sequence is noted within a diagram shape. Steps are linked by connecting lines and directional arrows.

Foreign Key

In a relational database, a foreign key is a field in one table that uniquely identifies a row of another table or the same table i.e. the foreign key is defined in a second table, but it refers to the primary key in the first table.


POST (Power-On Self-Test) is the diagnostic testing sequence that a computer’s basic input/output system (or “starting program”) runs to determine if the computer keyboard, random access memory, disk drives, and other hardware are working correctly.If the necessary hardware is detected and found to be operating properly, the computer begins to boot.


Blue screens are generally caused by problems with your computer’s hardware or issues with its hardware driver software. A BSOD is the result of low-level software crashing — or faulty hardware.A blue screen occurs when Windows encounters a STOP Error. This critical failure causes Windows to crash and stop working. The only thing Windows can do is stop the computer and restart it.

Doughnut Chart in Excel

If you have several parts of something one, you can demonstrate each item in one pie chart. But a doughnut chart can help you demonstrate the changes of those parts. A pie chart contains one data series.  A doughnut chart shows the relationship of parts to a whole, but a doughnut chart can contain more than one data series.

Thesaurus in MS Word

The thesaurus tool in Microsoft Office application can be used to find antonyms and synonyms. In MS Word 2010 thesaurus tool is under Review Tab in Proofing section. Along with thesaurus, there are also Spelling and Grammar, Research and Word Count in Proofing.



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