A:AnswerYes. You can use it like a monitor by using an HDMI cord from the computer.
You can also purchase a lightning X HDMI adapter and use your iPad or iPhone.
I have performed all these functions with this and larger Insignia products.
A:AnswerThis is a Smart TV, you can download the YouTube app without an external streaming device.
If you want to watch free over-the-air broadcasts from local channels you can purchase an antenna.