what does DM stand for in twitter?

[T-REX]

when ever there is competition or anything else on twitter then the twitter account of a company always reply by saying send us your DM, after the competition is finish
does that mean it will be direct message to the email as well

[John Filice]

Direct Message, basically a private message only they can see, intead of posting it where everyone can see it.

its for direct messaging aka private messaging

[Yong bonkers]

Definition: A direct message (DM) is a private message sent via Twitter to one of your followers. You can only send a direct message to a user who is following you; you can only receive direct messages from users you follow. Regarding the email part, if the user has the option he/she will receive it in the email too