A Bitcoin transaction is encrypted and digital.
The transaction is signed by the sending/outgoing wallet.
Then it is broadcasted on the internet and listed on the Block Explorer log that keeps track of all bitcoin transactions.
This log is divided into blocks. Once a block is locked (in average every 10 minutes) the actual transaction takes place.
It is recommended to wait until there are at least 2-3 confirmations in order to ensure a bitcoin transaction.
Don’t forget to get a wallet – Keep your coins safe!
It is strongly advised not to store your cryptocurrency on an exchange, only on a dedicated wallet that you own. Here you can read more about what is a Bitcoin Wallet.