Explanantion on pgbouncer please

Can some one please give me a bit more of a better explanation on how exactly
the pgbouncer works as I am now lost.

I'm not sure if it is pooling the connections cause surely if its not being
used the connections should go down not up i.e i run the webpage which has
my map running which is an open layers map reading geoserver all my data on
geoserver is from a database in postgres. When you start the web page it
goes to 46 connections and after moving around for a while and selecting the
different overlays that I have on the map it goes up to 75 connections after
not touching it for a while nothing happens the connections don't go up or
down, but when I move the map around and zoom then the connections increase
again to 84 connections.

Please help I'm stuck

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