Bitcoin transaction is similar to fiat currency that both of them need a confirmation; however, the form of confirmation is different. Fiat currency uses a personal signature or depending on the requirements of the sending company while Bitcoins creates a new block. Usually, the system creates one block every 10 minutes through mining and later adds it into a blockchain. Each block contains a transaction to be confirmed.
You can enter your transaction ID in block explorer to check your transfer status: https://live.blockcypher.com/btc/
To confirm if your bitcoin transaction is valid, you need at least 6 confirmations which mostly consumes an hour. If you wait for more than 72 hours and you still do not receive a confirmation, you should contact your wallet provider.
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