An internal call refers to the interaction between smart contracts within a blockchain. When one smart contract invokes a function from another contract, this is known as an internal call. This allows contracts to collaborate and execute complex workflows.For example, a decentralized application (dApp) might require a token to be transferred while interacting with a different contract that handles a game or a decentralized finance (DeFi) service. By using internal calls, the first contract can properly execute the token transfer and interact with the service without requiring separate external transactions.Internal calls can also create efficient operations by bundling several actions into a single transaction. This reduces network congestion and saves on transaction fees since multiple actions can be processed together.It’s important to note that internal calls can impact gas usage, as they consume resources on the blockchain. Understanding this mechanism helps developers design more efficient and effective smart contracts.