Shard Chains are a method used in blockchain technology to improve scalability and efficiency. They work by dividing the blockchain into smaller, manageable pieces called "shards." Each shard can process its own transactions and smart contracts independently, allowing the network to handle more operations simultaneously. This approach reduces the load on the main blockchain, making it faster and more efficient. By distributing the data and processing tasks across multiple shards, Shard Chains help prevent congestion and enhance the overall performance of the network, making it more suitable for a growing number of users and applications.