Can the ethereum attach message like bitcoin in transaction?

Question

Can the ethereum attach a message in transaction? for example, l want attach the message "hello" in common transaction(not contract create). thanks

Answer 1

Yes, every transaction has a data field. In the case of calls to smart contracts, the data field is used to specify what function is being called and with what parameters.

For a simple transfer of ether to a non-contract (an "externally owned account"), the data field is unused, so you can put whatever data you want in there.