Lets discuss about the POD to Node relationship and how you can restrict what pods are placed on what nodes. The concept of taints and tolerations can be a bit confusing at first.
Lets take the example and using a analogy of a bug approaching a person.
To prevent the bug from landing on the person, we sprayed the person with a repellent spray or a taint as we will call it. The bug is intolerant to the smell.