Internal Transaction

A value transfer or contract call that happens inside another transaction, executed by smart-contract code rather than initiated directly by an externally-owned account. Internal transactions are not separately recorded on the blockchain (they exist only as part of their parent transaction's execution trace), but block explorers reconstruct them from the trace and display them as 'internal txns' on address pages. They are essential for tracking funds through multi-step DeFi interactions, drainer-contract flows, and any complex on-chain activity.