If the clubface is aligned directly at the target line, the face angle is "square." An "open" face angle means the clubface is aligned to the right of the target line (for right-handed players). If the face angle is "closed," the clubface is aligned to the left of the target line (for right-handers).
It is not unusual for golf manufacturers to make golf clubs with face angles that are slightly open or slightly closed, usually by about 1-degree either way. Clubs that are made with square face angles can be "opened" or "closed" by the golfer simply by rotating the shaft slightly in the golfer's hands at address.
Why would a manufacturer not make all its golf clubs square, with the clubface pointing directly down the target line? Many golfers slice the golf ball, and a slightly closed clubface can help counteract the spin that produces slices. So "game-improvement clubs" are often manufactured with a 1-degree or 2-degree closed face angle.
Lower-handicap players tend to prefer square or even slightly open face angles.
Also see:
Do woods built with a closed face angle really help fight a slice?
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