What is negative feedback?
Negative feedback shuts a process off.
If you set you stove top temperature gauge to a set point, it will turn off the stove top. And it will turn the heat back on when the top cools. It keeps the process in balance.
Most of our processes are regulated by negative feedback.
Only a few are positive feedback. The one you may be most familiar with is blood clotting. Once damage occurs, blood flow to the site carries more and more platelets and fibrinogen until a clot forms that will keep the injury from losing any more blood. Otherwise, you could bleed out. This an over reaction, but one that can save your life.
Two more examples of positive feedback are childbirth and breastfeeding.