difference between module.exports and exports code example

Example 1: how to export module in node js

module.exports ={
 //functions
}

Example 2: module.exports vs exports

//module.exports used for object 
var log = {
            info: function (info) { 
                console.log('Info: ' + info);
            },
            warning:function (warning) { 
                console.log('Warning: ' + warning);
            },
            error:function (error) { 
                console.log('Error: ' + error);
            }
    };

module.exports = log

//exports used for function 

exports.SimpleMessage = 'Hello world';