Which direction does the current flow in a circuit?

Is this question about "conventional current"? If so, here's what Wikipedia says about it:

A flow of positive charges gives the same electric current, and has the same effect in a circuit, as an equal flow of negative charges in the opposite direction. Since current can be the flow of either positive or negative charges, or both, a convention for the direction of current which is independent of the type of charge carriers is needed. The direction of "conventional current" is defined arbitrarily to be the direction of the flow of positive charges.

In metals, which make up the wires and other conductors in most electrical circuits, the positive charges are immobile, and the charge carriers are electrons. Because the electron carries negative charge, the electron motion in a metal conductor is in the direction opposite to that of conventional (or electric) current.

Technicians are usually taught in college and trade schools "Conventional Theory". Engineers are usually taught in college and trade schools "Flow (Positive) Theory". The only difference is the mathematical formulas have to be tweaked differently for each theory.