A Bitcoin Transaction ID (TxID) is a unique identifier assigned to each transaction that occurs on the Bitcoin blockchain. It serves as a way to track and verify transactions on the network. The TxID is typically a 64-character-long string of letters and numbers, represented in hexadecimal format.
If you're using a Bitcoin wallet software or service, there is usually a transaction history or activity section where you can view details of your transactions, including the TxID. Once you have the TxID, you can use it to track the status of the transaction on the blockchain explorer or to accelerate the transaction via this service.