What is a Clad Coin?

By GovMint :

A clad coin is a type of coin comprising multiple layers of metal. In the case of most current U.S. coins, including dimes, quarters, and half dollars, these coins are clad with an inner core made of pure copper, surrounded by outer layers of other metals like nickel. The process of cladding allows for the production of durable coins with specific compositions tailored to meet various circulation and minting requirements. This technique has been utilized extensively since the mid-20th century to create coins that balance cost-effectiveness and durability, ensuring that coins can withstand everyday use's rigors while maintaining their distinct appearance.

Sources Used:

https://www.thesprucecrafts.com/what-are-clad-coins-768418

https://www.usmint.gov/learn/kids/coins-life/coin-composition