The adjective asynchronous rate what you don't have synchrony . This term (synchrony), meanwhile, refers to what coincides in time . There are, in this framework, various elements that are asynchronous.
It is called asynchronous communication to the communicative process that is carried out without temporal coincidence. This means that the transmission and reception of messages are separated by a certain period of weather .
The postal correspondence It is an example of asynchronous communication. The issuer (who writes the letter and sends it) knows that your message will not be answered instantly. The recipient (the one who receives the letter), on the other hand, also understands that he will be able to access the content just by physically receiving the correspondence (which is the message's transmission channel). A person you can write a letter in Portugal and send it on January 5 from that country to Colombia . The recipient receives the letter on 12th of January and read the message on that date. This is how this asynchronous communication develops.
The exhibition of an event by TV It can also be asynchronous when done in deferred. If a TV channel records the development of a concert that takes place on Saturday but broadcasts the following Tuesday, there is an asynchrony. The performance of the concert (Saturday) does not coincide in time with its television exhibition (Tuesday). On the other hand, if the transmission had been carried out live and direct, the viewers would have had the possibility to observe the Actions simultaneously to its real development.
It is very curious to note that, despite the need that human beings have developed in recent decades to obtain answers immediate and live at a rampant pace, much of our activities are characterized by an asynchronous flow. Postal correspondence is an example that may seem typical of the past, but its digital version, the email service, is also asynchronous.
Following the aforementioned need to accelerate communication, email has lost a lot of popularity, in pursuit of social networks and instant messaging services. Again, none of them occurs in a truly immediate way, since there is a large number of factors that entails a certain delay in the communication , such as the instability of the networks and the impossibility of carrying out all the processes simultaneously.
Technically, the chat It is the greatest exponent of synchronous communication - the opposite of asynchronous-, since it allows two or more individuals to have conversations with a fluency comparable to that which they could experience face to face. From a technical point of view, we cannot call it asynchronous because the chores more superficial are carried out in a row, one after the other, regardless of the thousands of intermediate processes.
It is important to note that asynchronous processes do not always happen for the same reasons. On the one hand there are those that cannot be carried out in another way, as is the case of postal correspondence: there is no means that allows us to send a letter physically from one point to another on the planet instantaneously. However, sometimes it is a decision that does not arise as a result of a limitation, but as part of a design aware.
In programming, many challenges related to the performance of processors arise, which usually force developers to prioritize certain processes or the immediacy with which they are carried out, and this results in the execution being synchronous or asynchronous. Depending on the program, the user does not always perceive this difference since - from his point of view - everything happens at high speed.