✏ In JavaScript, Execution Context is like a container. And it has 
   two components.
✏ They are, memory component or variable environment and code 
   component or thread of execution.
✏ In variable environment or memory component, it contains 
   variables, functions, and key-value pairs.
✏ But In thread of execution, it's a place where code is executed 
   at one line at a time. Because, JavaScript is a synchronous 
   single-threaded language i.e. JavaScript can only execute one 
   command at a time and in a specific order. It only go to the 
   next line once the current line has been finished execution.
              
            
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