Bitcoin has value because of the following two reasons:
It is useful.
It is useful because it helps doing things with our money what we have never done before.It is rare and limited.
It is limited because the protocol it is built which defines maximum cap of 21 million cap limit.
What does Bitcoin allows us?
- Send money anywhere, anytime and to anyone with no limits.
-Send as much or little as we like for negligible price.
-Send money potentially anonymously and with almost no delay.
-The blockchain allows us to verify all information - proof of work, ownership, existence, etc.