The GDN is generally the answer to why you see an ad for a website you just visited. Yes, Amazon has a similar platform.
Do not be confused, the display network is not about search ads. You see these ads on websites that you visit. You see them a ton on “click-bait” slideshows. These slideshows are all about just showing ads on as many pages as possible.
These google ads can also be useful when someone has left your website without taking action. This is called “retargeting,” which usually occurs when you visit a website with a “pixel” that your computer saves and when you go to a site on the GDN, you will see an ad for a company or product that you have already viewed online. This can also help grow brand awareness and trust. As a warning, it can also annoy people, so have a good strategy.
GDN ads can be textual, but are usually more graphic in nature and usually designed to get the visual attention of the reader.
We recommend you visit: https://support.google.com/adwords/answer/2404190?hl=en to get more information from Google directly
A word of precaution, know the settings and have a plan before spending money. You can waste a lot of money with the wrong settings.