Intrinsic value is for example the weight of a pound of gold, or the shiny color of it. The amount of money you get by selling it to someone is not intrinsic to the pound of gold, it can be taken away.
That's the simplest explanation I can give. You can expand that example to anything, including bitcoin. Bitcoin has no intrinsic value, it is just arbitrary data.
In economy the distinction is subtly different.
We try to separate the economical value of a value holder (what you can get for it on the market) from what you can use the actual value holder for if you decide not to exchange it for something else in the economy.
An apple has an intrinsic value. You can eat it and it makes your hunger go away.
But you can also exchange it for something else. That is its economical value.
A dollar bill has intrinsic value. It is made from fibers and you could burn them, for instance, to get some energy.
But you can also exchange it for something else. That is its economic value.
(You can actually see situations where intrinsic value of paper money becomes greater than its economic value because of hyper inflation. In such situations you can find that people keep their houses warm with the by then pretty worthless money bills.)
Since bitcoin is pretty useless when not being used extrinsically you can say that bitcoin has (pretty much) no intrinsic value whatsoever.
