I am going to keep this really simple:
Chitika can be used in combination with Adsense. They determine their ad content by what was recently searched by your in your search engine. Unlike Adsense which determines ads with user usage statistics. Chitika is very basic and can increase your traffic revenue by 10 to 30%. https://chitika.com/publishers/apply.php?refid=blowourminds - If you are accepted. You are welcome!
Adsense has NO referral program, where Chitika does. Chitika also has apps like "linx" which automatically finds words in your blog in creates links for CPC payments.