The Amazon tracker is, as other have noted, for the Amazon ads. It is only included when an Amazon ad is displayed on the page (this means it's not included for Bronze/Silver/Gold contributors, who get no ads).
The Google tracker is Google Analytics, and is used to monitor how the site is being used, to give a quantitative basis for future improvements.
13 minutes ago, This_guy1998 said:
Also to point out, I am a 2nd year IT major and so far from what I have learned so far about the web is that there is alot of things you can do with user data in order to make a site better and/or make money off of it. Without it every website online would charge you to just look at their site (web hosting isn't free). I pay $10 USD/month for my website plus around another $30-35 USD/year for my domain and the SSL certificate. I could host it myself but an internet connection with a static public IP address is more expensive (plus I would have to maintain the hardware).