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A sequential file is accessed one record at a time, from first to last, in order. Each record can be of varying length.

A direct (or random) file is accessed in any order, by record number. Each record must be of identical length.

A sequential file might look like this, with records separated by commas:

bear,skunk,moose,fish,alligator

A direct file with the same data would look (something) like this:

bear_____skunk____moose____fish_____alligator

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