A download manager is a computer program dedicated to the task of
downloading (and sometimes uploading) possibly unrelated stand-alone
files from (and sometimes to) the Internet for storage. This is unlike a
World Wide Web browser, which is mainly intended to browse web pages,
composed of a multitude of smaller files, where error-free moving of
files for permanent storage is of secondary importance. (A failed or
incomplete web page file rarely ruins the page.) The typical download
manager at a minimum provides means to recover from errors without
losing the work already completed, and can optionally split the file to
be downloaded (or uploaded) into 2 or more segments, which are then
moved in parallel, potentially making the process faster within the
limits of the available bandwidth. (A few servers are known to block
moving files in parallel segments, on the principle that server capacity
should be shared equally by all users.) Multi-source is the name given
to files that are downloaded in parallel.
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