By default, your Samsung Smart TV should come with apps like Netflix, Hulu etc. If you want to stream content from your iPad to your Samsung TV, you have a couple of options.
If you purchase an Apple TV, you can use AirPlay. That allows you to wirelessly transmit videos and content from your iPad. This is great for watching videos shot on either your iPhone or iPad. A number of third party apps like Netflix also support AirPlay.
Another option is to purchase a Google Chromecast. This provides similar functionality, such as streaming from apps like Netflix.
The Apple TV should provide you with the most comprehensive set of options, given its tight integration with iOS and your iPad.