You might notice that when you have been browsing a website looking for something, (for example, a pair of shoes), then you will start to see ads for those shoes when you're browsing the internet. The reason this happens is the cookies on your computer. Alternatively, you clicked 'yes' when you got asked if you wanted the website to remember your username and password.
Amazon will not pay you unless your affiliate sales reach a threshold of $10 if you choose to be paid by direct bank deposit or Amazon gift card, or $100 if you want to be paid by check. If you fail to reach the threshold, your affiliate balance is carried over to the next month and added to the sales you make then. Amazon pays affiliate sales at net 60 days, so, for example, sales that reach the threshold at the end of January will be paid in late March.
With Facebook ads, you can identify new potential leads by defining your ideal customer through the ads platform. Then, Facebook allows you to serve your ad content to those who exhibit the same types of behaviors that your target audience does. As you drive more relevant traffic to your brand site, you can improve outcomes, no matter what your ad goals may be.