The catcher can help their pitcher get more strike calls from the umpire by using a technique called "framing". This practice is a matter of a catcher keeping the mitt inside the strike zone, or making the pitch appear as close to the strikezone, when receiving the pitch, thereby giving the plate umpire the impression that the pitch is in the strike zone, even if it is not. When framing, a catcher will also hold their mitt still for a second or two so that the umpire has an opportunity to thoroughly consider their call (and, hopefully, let their innate biases influence their decision in a direction favorable to the catcher's team).