Is Italy a part of UK?

Short answer: No.
Long answer: UK, or United Kingdom is made up of England, Scotland, Wales and Northern Ireland.
Italy is located in southern Europe. The country noted to look like a high heeled boot on European maps also consists of the 2 largest islands in the Mediterranean sea, Sicily and Sardinia.
It is a founding member of the European Union, an economic and political union of 27 countries located in Europe.