In the blow-blow process, the molten glass is brought into its final shape in two blowing stages.
In the press-and-blow process, the molten glass is first pressed with a plunger to form an intermediate shape. The parison is then blown into its final shape by means of compressed air.
In the pressed glass process, the glass melt is pressed into a steel mould by a plunger.
In the hand-blown process, the molten glass is removed from the furnace / kiln by a glassworker using a blowpipe. The gob on the blowpipe is then blown into its final shape by means of an appropriate mould. This is a traditional manufacturing process for high-quality glassware.