Note that many websites have their own advertising, unrelated to adware.
This is an ad supported free software download. There is also a deluxe version available without adware.
Before the installation begins you are given a EULA where it states that 'advertising technology' will be installed with the program. During installation, you are asked to fill out a survey as part of the installation. It asks question such as income status, gender, education, zip code, and your interests. This is to better understand what kind of advertisements to send you.