If you are running the magento store with multiple administrator, its very difficult to find who edited the product,category,sales or some other admin activities.
When I googled the module to find the admin log details, I didn't get any module. one day when i surfing in to magento admin panel, surprisingly I saw the admin log details.
with the help of admin log, we can easily discover which administrator logged and which page/category/product they visited and modification they made.we can view the detailed information on the history, date and time of the action made. so if something happened wrong in your store, we can find out who/what could caused the problem.
In Magento admin panel under system->admin action log we can see all the admin activities with detailed information.
Please refer the below screen-shot for reference.
