High Quality Content by WIKIPEDIA articles! xar (short for eXtensible ARchive format) is an open source file archiver and the archiver's file format. Xar was created within the OpenDarwin project and is used in Mac OS X 10.5 for software installation routines – replacing gzipped pax files. One development branch of RPM, RPM5, uses xar. A file archiver is a computer program that combines a number of files together into one archive file, or a series of archive files, for easier transportation or storage. Many file archivers employ archive formats that provide lossless data compression to reduce the size of the archive which is often useful for transferring a large number of individual files over a high latency network like the Internet.

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