Call them, add-on cards, internal cars, expansion cards, or interface cards, they are the same and all have the same purpose to serve. And, that is to give your computers the ability to perform new or existing applications effectively. Such cards are responsible to upgrade your computer, as it offers extra capabilities to the system. 

There are many types of laptop add-on cards. Plus, each has its unique application to add to the system. Here you will find the better options for such expansion cards to do the relevant job. Not sure how to pick the right card for your need, then let us know we can help.