The conventional direction of current is from the positive terminal to the negative terminal, but electrons flow from the negative terminal to the positive terminal. How is this possible? Please explain.
Direction of current
Yes, that's true, the electrons, negatively charged particles flow from negative terminal to positive terminal. But for historical reason we follow a convention in which we imagine equivalent positively charged particles flowing from positive terminal to negative terminal.
As positive implies higher potential of any quantity and negative implies lower.