What is minification, uglification and concatenation

Minification:

• To remove unnecessary whitespace and redundant/optional tokens like semicolons and curlys.
• Minifying your code speeds up your page loading, making visitors and search engines happy and it is also readable. Most major browsers minify the code before execution.

var myName = 'Sky' 

//Minified version will be - 

var myName='Sky' 

// removed whitespace

Uglification:

• To convert code in such a format the logic can't be understand easily.
• It renames the variables and function to hide the original intent.
• It converts long method name i.e. myLongMethod() to short one i.e a().
• Once it is used there's no way to reverse it back.

self.myName = 'xyz';

function(self.myName){
console.log(self.myName);
}

// Uglification would be

t.myName = 'xyz';
function(t.myName){console.log(t.myName)}

Concatenation:

• It Merges all specified files into a single file.