Question

what is the use of dust bin

Answer 1

you can throw dirt , garbage , waste materials in it.

Answer 2

Dustbin is a large container with a lid, used for putting rubbish/garbage in, usually kept outside the house British/​American. Garbage and trash are both used in North American English. Inside the home, garbage tends to mean waste food and other wet material, while trash is paper, cardboard and dry material.