Audit trail
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An audit trail is a record of transactions or communications all related to a single person, account or other entity. Webopedia defines it as "a record showing who has accessed a computer system and what operations he or she has performed during a given period of time." ([1] (http://www.webopedia.com/TERM/A/audit_trail.html))
In telecommunication, the term means a record of both completed and attempted accesses and service, or data forming a logical path linking a sequence of events, used to trace the transactions that have affected the contents of a record.
In information or communications security it means a chronological record of system activities to enable the reconstruction and examination of the sequence of events and/or changes in an event.
In accounting, it refers to documentation of detailed transactions supporting summary ledger entries. This documentation may be on paper or electronic records.