Transaction ID or TX ID is defined as a string of letters and numbers used to identify an exchange of cryptocurrency between two parties. Every transaction has a unique ID.
Because blockchains are public data, many websites have been built to let you explore the data. These are known as blockchain explorers. Using a blockchain explorer, you can copy/paste your transaction ID and easily find the status of your transaction.
Just make sure you’re using a blockchain explorer that has access to your blockchain. Some blockchain explorers only have access to one blockchain, like bitcoin.