You use a session to store values that are required over the course of a single 
visit, and a cookie to store more persistent data that is used over multiple 
visits. 
  Session: when you close the browser the session gets flushed. Which means the 
browser will not recognize the user next time he/she browse the page unlike 
cookie.
   
  So why do I need session? OR maybe I didn’t understand session



 

        
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