iMessage

iMessage is the messaging service that iOS devices use to talk to each other. When you send a text to another user who has an iPhone you are not really sending a text because your phone is smart enough to send an iMessage instead. The iMessage communication is free. It is represented at your iPhone by a bright blue bubble instead of the green bubbles for texting. You can iMessage to regular Apple laptops too. This is yet another thing I've learned in working with smart people at my job.