The conventional current would be characterized as the charge per unit time transferred in that certain orientation. The kind of charge carrier seems to be unimportant under conventional current.
The flow of electrons is referred to as electron current. Electrons move from either the negative () towards the positive () output terminal. Such current behaves as though positive charge particles are critical for the overall flow of current. Traditional current travels from the positive towards the negative terminals.
In conventional current, this same movement of electrons is generally supposed to be the opposite of such movement of protons.
Therefore, the simplest thing to understand would be to imagine that the passage of positive charge particles represents current flow.