A tool that lists the changes you've made to your account during the past two years. See details about changes like when you paused your campaign, who added a keyword, and the amounts of your previous budgets.

• You can view all changes for a particular date range, filter the results by the type of change (such as budget adjustments or keyword edits), or see changes for a particular campaign or ad group.
• The change history tool shows each change within a timeline, mapped to your account data (like impressions, clicks, conversions, clickthrough rate, and cost). Compare your changes with the timeline of performance data to help know which changes may have contributed to changes in your performance.
• If you've given other people access to your account using their own login, you can also use the tool to see who made certain changes.
• You can find change history in the "Tools" menu, or go directly to the tool by visiting ads.google.com/ch/ChangeHistory

* Nguồn: Google