Each contestant is on their own. They place cameras themselves to record their activities. The goal is to be the last one remaining.
They get to bring a limited amount of equipment and supplies with them, there is no way for them to get anything additional from outside. They need to build their own shelter and find their own food.
They each have a satellite phone they can use to call for rescue or to notify the organisers that they would like to leave. Doing either means they lose.
The winner will be told when they're the last one remaining, they have no way of knowing how many are left at any point otherwise.
That's the show, it's extremely good.
I don't seem to be able to buy this in Australia. Yet I can buy a dozen different products to selectively kill the clover in my lawn.
That sucks, I really like clover. It's nice to walk on.