Ganesh Visarjan

The Ganesh idol that we bring at our home/society or area, on Ganesh Chaturthi (4th day after new moon of Bhadrapad month), is set for visarjan (immersion/dissolution ) on "Anant Chaturdarshi" (day before full moon of same month). Why do we do visarjan? What does it symbolize? That which has ending is dissolved to endless(Anant= …