An opener is a device designed to facilitate the opening of various types of containers, such as bottles, cans, or jars. Common examples include bottle openers, can openers, and jar openers. These tools often feature a simple mechanical design that allows users to apply leverage or cutting action to access the contents inside. Opener devices come in various shapes and sizes, ranging from handheld tools to electric models. Some openers, like the churchkey bottle opener, are specifically designed for certain types of bottles, while others, like the manual can opener, are versatile enough to handle different can sizes.