A bottle opener is a simple tool designed to remove the metal caps from bottles, typically those containing beverages like beer or soda. They come in various shapes and sizes, including handheld devices, wall-mounted openers, and multi-tools that combine several functions. Most bottle openers work by leveraging a fulcrum to pry off the cap with minimal effort. Bottle openers can be made from different materials, such as stainless steel, plastic, or wood. Some are designed for specific types of bottles, while others are versatile enough to handle various cap styles. Popular designs include the classic churchkey and the modern corkscrew for wine bottles.