All cryptocurrencies are basically computer generated currencies. They exist by “mining” as its main function, its purpose is confirming record of movements and accounts known as blockchain. Coins as token are given to those miners who successfully completed a problem.
One’s a cryptocurrency is generated, they are stored in a completely secured wallet that is impossible of hacking. The coins can then be send to another wallet. Every transaction gets appended on the blockchain and verified by mining activity in the ecosystem.
Producing this coins are not unlimited, meaning they are limited and its generation velocity of the coin is variable. At first, it will be fast and in the long run it becomes slower. In case of BTC or Bitcoin, it is already known that the value of its coins is now record high, as network expands. More and more users compete a similar coins meaning coin price goes up.