Public health is well...the health of the public. It’s the wellness and prevention of disease of people in the community (sorry to bring it up but it’s a good example and it’s current: like wearing masks to stores and such.) Sometimes, we do not like it, but it’s to make sure the public health (ie. the overall health of the people in said population) are okay and healthy. It can be described as...say 3/4’s of the people in that comunity are sick, this means that the “public health” would be poor. And in vice versa it would be good. It’s the generalization of how the overall health is in a total when it comes to a community. (Sorry if this was confusing-)