What is the difference of map vs path?

What is the difference between map vs path when building a theme / module?

Which are the restrictions?

var config = {

 map: {
    '*': {
        'jqueryjs': 'India_Newtheme/js/jquery',
        'bootstrapmin': 'India_Newtheme/js/vendor/bootstrap.min'
    }
  },
  paths: {            
      'jqueryjs': 'India_Newtheme/js/jquery',
      'bootstrapmin': 'India_Newtheme/js/vendor/bootstrap.min'
  }
};