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This will display all-round view of relations of Contacts module with other modules and maintains log of complete history.
You can keep track of following details in Contacts module

Activities | To view or create Events and To-dos on a Contact record |
Emails | To view the Emails sent to Contact record |
Activity History | To view all Events and To-dos that are completed or status changed as held |
Documents | To view the Documents related to the Contact record |