What is the role of a salt bridge in a Daniell cell?

[johncena]

What is the function of salt bridge in a daniell cell?Why KNO₃ is used in salt bridge ?

 

[symbolipoint]

One electrode is the anode half reaction; the other electrode is the cathode half reaction. How do you complete a circuit?

(Maybe before I responded I should have searched for information about Daniel cell).

You may find this article about salt bridge informative:
http://en.wikipedia.org/wiki/Salt_bridge