PCWorld Forums: What Do These Words Actually Mean? Add-ins, Add-ons, Plug-ins, Apps, Applications, And Utilities - PCWorld Forums

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Browsers:
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A - There Are Extensions ( File Type Formats ), And,

B - There Are Extensions ( Extras For Browsers, For Instance ).

It Is Possible To Have ( B ) --> Inside ( A ).

CHROME Uses --> '*.CRX'.

FF Uses --> '*.XPI' And Others.

OPERA Uses --> '*.OEX'.

It Is Possible To Install ( B ) Online Directly From The Browser Site, Or, Install The Equivalent File ( A ) Offline From Your Hard Drive.

[quote]
App: A program written for a mobile operating system like iOS or Android. Despite the name, apps aren't necessarily applications. Some are games, utilities, or suites.
[end quote]
App is actually short for Application.A mobile app however better fits the above discription

Sorry about the quote box.