What would happen if no salt bridge is used in electroCHMemical cell ?

What are Electrochemical cells ? What would happen if no salt bridge were used in electrochemical cell like Zn - Cu cell ? Write the Nernst equation to calculate the emf of this cell.

What is salt bridge? Why is it used in electrochemical cell?

Why is salt-bridge used?

What is the role of salt-bridge in an electrochemical cell?