What is a substitutional alloy in sterling silver mean explain?

A substitutional alloy in sterling silver refers to the mixture of metals where some of the silver atoms are replaced by other metal atoms, typically copper. In sterling silver, the standard composition is 92.5% silver and 7.5% copper, allowing the alloy to retain desirable properties such as strength and durability while maintaining the visual appeal of silver. This substitution enhances the material's hardness and resistance to tarnish, making it more suitable for various applications, including jewelry and utensils.