Many newer PC gaming controllers have special switches on the back called trigger locks. Flipping these switches lets you change how far you need to press the trigger buttons before they register an input. By default, the triggers will be unlocked, or set to "analog" mode. This means that the triggers have a full range of motion, and can track exactly how much pressure you're putting on them. The most common use for this feature is in racing games — the harder you press the trigger, the harder you jam your foot down on the gas pedal. When you flip the switches to lock the triggers, you're setting them to "digital" mode. Digital triggers don't move very far, and only track whether you're pressing them at all. They're not pressure-sensitive. This is great in shooting games, where you need to press the triggers as fast as possible.