Definitions about DFA and DFP and AdWords
DoubleClick for Advertisers (DFA).
Get the most from your search campaigns with tools that save you time, drive results and help you make smarter decisions - for even the largest search campaigns, across platforms.
DFA is an ad server which is used to track impressions and clicks for your creative. You can't buy inventory through DFA. You can only track the performance of your campaigns. Main functions of DFA is trafficking and reporting.
DoubleClick for Publishers (DFP)
DoubleClick for Publishers (DFP) is a comprehensive hosted ad serving platform that streamlines your ad management functions and allows you to generate even-greater advertising margins.
AdWords is a tool though which you can advertise your text ads on Google search page and other sites in their network,
you can also run display ad campaigns through AdWords. Its a Ad network, which provides a platform to small/medium advertiser to upload their advertisement, and select inventory where they'd want their Ads to serve. Adwords does not give you an option to generate Tags like DFA and share these tags with the publisher you wish to work with.
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