Origin of electrode potential with respect to dissolution and deposition

Anode is the place where oxidation occur and oxidation is loss of electron. That means dissolution occur. The electrode potential thus developed is called oxidation potential. 
For ex., Zn/Zn2+
That means the dissolution of zinc occur and it gets oxidised as Zn​2+. The electrode potential is represented as E0Zn/Zn​2+

Cathode is the place where reduction occur and reduction is gain of electron. That means deposition occur. The electrode potential thus developed is called reduction potential. 
For ex., Cu2+/Cu
That means the copper ion get deposited as copper after gaining electrons and reduced to Cu. The electrode potential is represented as E0Cu​2+/Cu

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