It is generally appearing the controller name in URL. To remove controller name from url just go to application\config\roughts.php & update the file as following. Hope your problem will be solved. Thanks!
OOP Stands for Object Oriented Programming. OOP is not a programming language it is just a method or technique of programming where a programmer write code using a standard way rather than procedural way. The main thing of OOP is Class & Object (Instant). So, what is Class & Object? Well, Class is a set