Bitcoin is meant to be use the same way we use our traditional fiat currency but the difference is that bitcoin is in digital form. It is a store of value, it can be used for purchasing of good and payment of services, It makes financial transaction easy and global.
This is it in a nutshell, it's no different from other investments like stocks and gold...it's just digital and that's what makes people uncomfortable. Pretty soon it will be so common that we will all forget there was ever a time when currency wasn't digital.