Open Source computer software is that whose “source code”, the code which generates the software's system or purpose, is either in the Public Domain or, more commonly, is copyright-protected by one or more persons or entities and licensed to anyone according to an Open Source License. This usually grants permission to use and redistribute the software, as well as to modify its source code and distribute modified...

Metadata (“about” or “above” + “data” or “information”), literally “data about data”, is information that describes another set of data. A common example is a library catalog card, which contains data about the contents and location of a book: It is data about the data in the book referred to by the card. Other common contents of metadata include the source or author of the described dataset, how it should be accessed,...

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applications and code