Apple TV does have some free channels and content.
So yes you can watch some free content on Apple TV.
But to get the most out of the Apple TV it's best to pay a subscription to the Apple TV content and it's well worth it.
Also you do need internet for Apple TV.
To watch Apple TV you need an internet connection such as Cable Internet, DSL Internet or Fiber Optic Internet or an unlimited wireless internet connection.
The Apple TV works by streaming content from web servers through the internet and without an internet connection the Apple TV device cannot stream those videos.
The cost of an Apple TV monthly subscription is $4.99 per month.
That is after a 7 day free trial to Apple TV.
You can sign up for a free 7 day trial for Apple TV and cancel at anytime within those 7 days of the Trial if you're not happy with the subscription.
If you signup for the 7 day free trial to Apple TV and don't cancel the subscription within those 7 days then you'll be charged the $4.99 monthly fee to your credit card, debit card or Paypal account.
I pay the $4.99 per month for the Apple TV and it's well worth it.
Apple TV plus costs $5.00 per month or you can pay a yearly subscription for Apple TV which costs $50.00 per year.
I started paying for the year as it's easier than paying monthly.