What is difference between random file access and sequencial flle access in c?

What is difference between random file access and sequencial flle access in c?
File constructed in a manner in which records may be placed in a random order; also called direct access file. Each record in a random access file has associated with it a relative index number. Whenever a record is read from a random access file, a computer program must produce a relative index number for this record in order to locate the record in the file. This type of file design offers the following
(1) it provides rapid access to the desired information. In a decision-making environment where information is needed quickly, random access is a requisite to rapid retrieval;
(2) it is efficient for retrieving a relatively few records at a time; and
(3) it provides a method of keeping files up to date as transactions or events occur
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