Messages

Source (google.com.pk)
Messages Biography
If you’re a texter, you’ll love Messages on iPhone, iPad, and iPod touch. Now they all come with iMessage, a service that’s an even better kind of texting. Because it’s free for you and anyone texting over Wi-Fi using an iOS device or Mac with iMessage. And it’s unlimited.* So say as much as you want.
Exchange words. Or photos. Or videos.

iMessage lets you send messages back and forth with anyone on iPad, iPhone, iPod touch, or a Mac running Mountain Lion. Send photos, videos, locations, and contacts, too. If you have more than one Apple device, iMessage keeps the conversation going across all of them. And you can text and send photos and videos via MMS to other mobile phones over cellular networks. Even ask Siri to text for you. Just say “Tell Peter I’m on my way” and Siri writes your message and fires it off.
Text one. Text all.

Send a message to one person or to many friends at once — along with photos, videos, or links you like. When someone replies, everyone sees it. With more people you’ll get more texts, but remember, it’s iMessage, so every text is free over Wi-Fi.*
Get the message?

It’s reassuring to know your text was read — or even received. iMessage tells you if your text was delivered. If the recipient has read receipts enabled, you’ll see that your message was read, too. And iMessage shows you when someone’s in the middle of a reply, so your conversation can continue naturally.
Blue is best.

On iPhone, when your text bubble is blue instead of green, you’ll know you’re using iMessage instead of SMS. You’ll know that you can get a quicker response. You’ll know that the text session is free. You’ll know it’s been sent to all your recipients’ Apple devices. And you’ll know they received the text. SMS texters will be green with envy.
A message in its most general meaning is an object of communication. It is a vessel which provides information. Yet, it can also be this information. Therefore, its meaning is dependent upon the context in which it is used; the term may apply to both the information and its form. A communiqué (pronounced /kəˈmjuːnɨkeɪ/) is a brief report or statement released by a public agency.
In communications science

More precisely, in communications science, a message is information which is sent from a source to a receiver. Some common definitions include:

    Any thought or idea expressed in a language, prepared in a form suitable for transmission by any means of communication.
    An arbitrary amount of information whose beginning and end are defined or implied.

In communication between humans, messages can be verbal or nonverbal:

    A verbal message is an exchange of information using words. Examples include face-to-face communication, telephone calls, voicemails, etc.
    A nonverbal message is communicated through actions or behaviors rather than words. Examples include the use of body language and the actions made by an individual idea.

In computer science

There are two main senses of the word "message" in computer science: messages passed within software, which may or may not be human-readable, and human-readable messages delivered via computer software for person-to-person communication.

    Message passing is a form of communication used in concurrent and parallel computing, object-oriented programming, and interprocess communication, where communication is made by sending messages to recipients. In a related use of this sense of a message, in object-oriented programming languages such as Smalltalk or Java, a message is sent to an object, specifying a request for action.

    Instant messaging and e-mail are examples of computer software designed for delivering human-readable messages in formatted or unformatted text, from one person to another.

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