How do Google Ad words work?

There are 2 Case studieswrite one page of each one.
Case study 4A
How do Google Ad words work? Please watch the video and reflect on one page. Watch the video.
Case study 4B
Alexa Look was a great idea at the time. It failed miserably. Why do you think it failed and what could Amazon have done better to make it successful? What were some its flaws? Was it too early in the adoption cycle? Reflect on one page and don’t forget to cite. Watch the video do some reserch