36 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.
4. The Types of Messages a. Air Mail
Airmail or air mail is mail that is transported by aircraft. It typically arrives more quickly than surface mail, and usually costs more to send. Airmail may be
the only option for sending mail to some destinations, such as overseas, if the mail cannot wait the time it would take to arrive by ship, sometimes weeks.
b. Air-speeded
The study of airmail is known as aerophilately. A postal service may sometimes opt to transport some regular mail by air, perhaps because other
transportation is unavailable. It is usually impossible to know this by examining an envelope, and such items are not considered airmail. Generally, airmail
would take a guaranteed and scheduled flight and arrive first, while air-speeded
37 mail would wait for a non-guaranteed and merely available flight and would
arrive later than normal airmail. A letter sent via airmail may be called an aerogramme, aerogram, air letter or
simply airmail letter. However, aerogramme and aerogram may also refer to a specific kind of airmail letter which is its own envelope; see aerogram.
The choice to send a letter by air is indicated either by a handwritten note on the envelope, by the use of special labels called airmail etiquettes, or by the use
of specially-marked envelopes. Special postage stamps may also be available, or required; the rules vary in different countries.
c. Message in a bottle.
A message in a bottle is a form of communication whereby a message is sealed in a container archetypically a glass bottle, but could be any medium, so
long as it floats and remains waterproof and released into the sea or ocean. Such messages are not intended for a specific person, but to end up wherever the
currents carry them. Because of their simplicity they are often associated with people stranded on a deserted island, attempting to be rescued. However, many
people release such messages for pleasure, to see how far their message can travel and to make new friends. They are also used for scientific studies of
ocean currents. The phrase message in a bottle has also come to refer to any message sent without an intended destination.
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d. SMS
Short Message Service SMS is a communication service standardized in the GSM mobile communication system, using standardized communications
protocols allowing the interchange of short text messages between mobile telephone devices. SMS text messaging is the most widely used data application
on the planet, with 2.4 billion active users, or 74 of all mobile phone subscribers sending and receiving text messages on their phones. The SMS
technology has facilitated the development and growth of text messaging. The connection between the phenomenon of text messaging and the underlying
technology is so great that in parts of the world the term SMS is used as a synonym for a text message or the act of sending a text message, even when a
different protocol is being used. SMS as used on modern handsets was originally defined as part of the GSM
series of standards in 1985 as a means of sending messages of up to 160 characters including spaces, to and from GSM mobile handsets. Since then,
support for the service has expanded to include alternative mobile standards such as ANSI CDMA networks and Digital AMPS, as well as satellite and
landline networks. Most SMS messages are mobile-to-mobile text messages, though the standard supports other types of broadcast messaging as well.
e. Instant Messaging.
