Question:What is function? How can you define function in JavaScript? 

Answer 
Function: 

1. A colloection of statements/code which can perform a specific task and can be executed by an event of call to that function. 
2. We can have a) Built-in function and 2) User-defined functions

Syntax of defining a function:

function functionName(functionParameter list){
 
   statements

}

Example:

function add(a,b){
   return a+b;
} 

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