Direct Messages are private messages sent from one Twitter user to other Twitter users. You can use Direct Messages for one-on-one private conversations, or between groups of users
One-on-one Messages:
You can only send Direct Messages to users who follow you.
You can receive Messages from any user that you follow.
Hence, the moment you follow @icicibank, we follow you back instantly and you can start sending Direct Message( DM) to us for transactions.
To start direct messaging, click on the message icon on your screen.