What is wallet? How is it uniquely identified? What is wallet? 
How is it uniquely identified?
What is a wallet?


Its software that stores your cryptocurrency, manages the keys to your wallet, and watches for transactions.


  How is it uniquely identified?


As jakob said above, it is made unique by the keys and addresses. 

With the Bitcoin wallet addresses being 26-35 numerals and characters long, you can see how it is unique.

Hope this helped!