DAP = Download Accelerator Plus (It is from speedbit.com)
It is an advert for the program 'Download Accelerator Plus Trace Cleaner' which is available to purchase.
This is what it does:
Every time you visit a site or download a file, pictures, temporary html pages and URL history are left on your computer so anyone who uses your computer can see what websites you've visited. With DAP all traces of your online Internet activities are permanently erased and unrecoverable on your PC.
If you really want to erase your history You can do this yourself for free just by deleting your browsing etc history.
I advise you to Stop clicking on Adverts
I'll repeat that - Stop clicking on Adverts and also on anything else you don't understand.