In computing, a library is a collection of similar objects that are stored for occasional use - most frequently, programs in source code or object code form, data files, scripts, templates, fonts, and physical storage units such as tape cartridges. Here are some common types of libraries.
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1) A program library is a collection of (usually) precompiled, reusable programming routines that a programmer can "call" when writing code so that the programmer doesn't have to write it. A dynamic link library (DLL) is one type of program library. Another type of program library is a class library, whose stored routines are class definitions in object-oriented programming (OOP). Graphical user interface (GUI) components such as scroll bars, buttons, and windowing routines are generally stored in a class library.
2) A storage library is a collection of physical storage media such as tapes or disks and a way to access them. A tape library, for example, contains tape cartridges and a mechanism that moves them into and out of the drive(s) where their content is read or updated.
3) A data library is the area of a data center (a centralized area housing computer systems and equipment) where storage media are archived. Online service providers also sometimes refer to a directory on a server containing files for downloading as a data library.
4) A virtual library is simply the online version of the traditional library. Books and documents are made available over the Web, and may be read on line or downloaded.