Alloids are a type of alloy that contain at least one principal metal and additional elements, which may include other metals or non-metals. They are engineered to enhance specific properties, such as strength, corrosion resistance, or conductivity. Unlike traditional alloys, alloids often exhibit unique characteristics that can be tailored for specialized applications. The term is less commonly used in scientific literature compared to "alloy," but it emphasizes the engineered nature of these materials.