Information Technologies have been used for ages to share information and knowledge between humans: this can either be done by leaving long-lasting traces over the matter, or by using varying kind of energies to produce a signal that.
Stone is the most durable matter to preserve knowledge as ancestral monuments and even prehistoric drawings or millenary tablets from our ancestors are the oldest traces that remains from human history.
Paper already started to spread from China around 2000 years ago as as useful writing support, and humanity has produced since an enormous quantity of manuscripts that could much more easily be shared and spent world-wide.
Then the printing age took place and spread widely from Europe int he beginning of the16th century, which demultiplexed the quantity of printed medias and enabled to provide the same information to everyone and at shortest time intervals.
Most industrial revolutions since contributed to favor the increase in speed and quantity of information, and today such technologies have become so much optimized and used that we sort of all have the world (wide web) in our pocket and nearly in real-time, when all is working ok!
Indeed, modern technologies works with low-power batteries and are sorts of smart watches that constantly check and respond to any signal they can identify as an input, and for which they are required to react on.
We last introduce the general concepts for Information technology as a user point of view to get prepared for working with DYI computer peripherals and wireless communication.