Auto-lock sliders: A small locking mechanism inside the slider holds the slider in place until the slider tab is pulled, which means the slider will be locked when there's no force. This prevents the slider from moving by itself or by mistake. It's widely used on zippers for sportswear, jackets, furniture, etc.
Pin-lock sliders: There's a pin in the slider, when the puller is pressed down into the zippers, the pin will lock the sliders. They're widely on zippers for bedding, upholstery, clothing, etc.
