Transaction Hash: Transaction Hash, also known as Txn Hash or Transaction ID, is a string of numbers and/or letters given to each transaction made on any blockchain. Think of a Transaction Hash or Transaction ID as a receipt number for an on chain transaction. Any time you send or receive currency, either Fiat or Cryptocurrency, a unique ID is created to trace the transaction. The Transaction Hash is used to track the status of its related transaction or locate funds.
You can find your Transaction Hash in the transaction details from the wallet you are using. From there, it may show the Transaction Hash, or you can view on the block explorer (ex: etherscan.io).