You can use Display Planner to:
- A) see which images and text ads within your campaign are performing best on the specific websites you are targeting
- B) run a report to determine which keywords are most likely to convert based on the past 30-days of your campaign
- C) see potential webpages where your ad can appear based on your keywords
- D) managed CPC bids for contextual campaigns within your account
Explanation: Display Planner shows you the potential reach and cost of targeting ideas to help you plan your Display Network campaigns.You enter keywords, topics, or websites that you think are likely to match your customer interests, and your landing page. That will get Display Planner started with the types of targeting and keywords that can build the foundation of your campaign.
Read more here: https://support.google.com/adwords/answer/3056115?hl=en