Beer cans are containers made primarily of aluminum or steel, designed to hold beer and other carbonated beverages. They are popular for their lightweight, durability, and ability to keep the beer fresh. The can's airtight seal prevents light and oxygen from affecting the beer's flavor, making it a preferred choice for many breweries. Cans come in various sizes, with the standard size being 12 ounces. They often feature colorful labels and designs that represent the brand, such as craft breweries or major beer companies. Additionally, beer cans are recyclable, contributing to environmental sustainability efforts.