The difference is conversion rate, which explains about ROI (Return On Investment.) The most common campaign types are search network, shopping campaigns, dynamic search, etc.
Meanwhile to say a technique to increase ROI which use adds and might be affiliated marketing or dynamic marketing.
Affiliate marketing means a process of earning a commission through promoting other companies products. You can find the product you like, promote it to others and earn a piece of profit for each sale that you make.
However, In branding campaign, an advertiser need explore of his brand on major sites and applications. The most popular technique is Remarketing, Display Ads, Youtube Ads, and custom ads target.