A Service in Angular could better be described as the function or object which is available to the whole of your Angular JS application and is limited to it. That means these services could be used only within the Angular JS application. There are some 30 in-built services within Angular that could be used inside Angular JS applications. Wish to learn Angular and become certified? Then check out the Angular certification course from Intellipaat. Also, watch the following video on Angular Training to get a better understanding.