Salesforce keeps an Audit Trail of configuration changes made in the Setup section. Audit Trail helps the organization administration track recent setup changes. This is very helpful if there are multiple administrators for an organization.

A business scenario: Alok Sinfal is working as system administrator at Universal Containers. He has just received an e-mail from business user Nishant Nagre, who says that someone has recently reset his password (because Nishant has received a password reset e-mail from Salesforce). If Alok Sinfal wants to track who did this, then he has to use Setup and Audit Trail in Salesforce. Only the system administrator or a user with View Setup and Configuration permissions can use this feature. To access the Audit Trail, click on Setup (gear icon) | Setup | SETTINGS | Security | View Setup Audit Trail.