What's the difference between Smart TV and Roku TV ?

I know what is a Roku TV. It has Roku pre-installed.

But what is a Smart TV ?

A TV with an Internet connection and software to run various downloadable apps.

Doc943 said:

A TV with an Internet connection and software to run various downloadable apps.

Such as ?

Like it can download YouTube, Netflix, CNN etc ?
I'm in Canada, so don't bother to mention Hulu, Sling and the likes.

Thank you for the reply.

These days it is lot easy to distinguish between the two. Smart TVs have good CPU with quad core processor to run OS like lg webos and Android tv on it. They also have built in features like wifi, Miracast, bluetooth connectivity etc.. Roku TV is a sort of media player or device which is used in tv which lacks smart tv software and hardware features.

ROKU

Internet Streaming Service: Amazon Cloud Player, Amazon Instant Video, MLB.tv, MP3Tunes, MediaFly, Netflix, Pandora, Picasa, SHOUTcast, TuneIn
Functionality: Internet radio playback, Internet video playback, Digital photo playback, On-line Internet gaming
Features: Streaming Media Player, Full-HD 1080p Video Output, Digital over HDMI Audio, IR Receiver, Enhanced Remote Control with Motion-Control
Connectivity: WiFi, Ethernet, USB 2.0
Supported Memory card: microSD
Power Consumption: 3.5 Watt
Headphone Jack: Built-in
The Smart TV's, already have some of those APP's pre-installed. I have a VIZIO with wifi comes with Netflix, Amazon, YouTube, and some sort of Travel App.