jQuery change icon on click [duplicate]

Question

noob question here (beginner to JavaScript & jQuery). I am learning code via codecademy etc., and they are teaching to use the following:

$('.projects-button').on('click', function() {
 $('.projects').show();
  });

Then, while researching something on Stack, I found the following:

$('.projects-button').click(function() {
 $('.projects').show(); 
  });

Is there a difference between "on click function," and "click function???"