Google Analytics offers many features and reports that can help you analyze, understand, and improve your online advertising efforts.
The AdWords reports give you post-click performance metrics for your traffic from AdWords. These reports help you see what happens after visitors click on your ads. You can view metrics for site usage, goal conversions, ecommerce, and revenue, like ROI (return on investment) and RPC (revenue per click).
Remarketing with Google Analytics lets you segment your audience and deliver relevant ads for your Google Display Network campaigns based on the actions people have taken on your site.
Demographics and Interests reporting helps you understand how your audience breaks down by age, gender, and interests. You can use this information to target your ads to the specific audiences that are most likely to consume your content or purchase your products.