| Helper is a COLLECTION of common functions which we can use within Models, Views as well as in Controllers. Once we include the helper FILE, we can get access to the functions. | Library is a class that has a set of functions that permits for creating an instance of that class by $this->load->library() function. |
| It is not WRITTEN in object-oriented format. | It is written in an object-oriented format. |
| It can be CALLED in the same manner you call PHP functions. | You must create an object of the class to call library functions by using the $this->library_name->method(). |
| All built-in helper file names are suffixed with a word _helper (ex: email_helper.php). | All built-in library files do not have a SPECIFIC suffix. |
