A "church key" is a simple tool used primarily for opening bottles and cans. Traditionally, it features a pointed end for puncturing metal caps and a flat end for prying them off. The name is believed to have originated from its resemblance to the large keys used to open church doors. Despite its name, a church key is not associated with any religious practices. It is commonly made of metal and is a staple in many households, especially for those who enjoy beverages like beer or soda. The design has remained largely unchanged, reflecting its effectiveness and practicality.