Il caos della natura

Sei in internet

Internet is the biggest computer network in the world and it allows users to look for information, share data, send and receive e-mails, chat, download files and a lot of other things linked to the network.
The essential things that users need to connect to the Internet are:

• A computer
• An operating system
• An internet browser that can understand the last version of HTML, and so that is up to date.

We already know what a computer and an operating system is, but not all of us knows what the HTML is.
Html is the acronym of Hypertext Mark-up Language, and it isn’t a programming language, in fact it takes his origins from SGML, that stands for Standard Generalized Mark-up Language, and that was used to publish documents.
Html can only define the layout, the fonts, the colours and the graphic elements that form the page, but it can’t execute instructions.
The only way to execute instructions on data in the form of an html page is to use some other languages, like PHP or ASP, or to use a CGI script that can work like a glue between standard languages (like c, c++, Pascal……) and html.
The specific language, developed for the web, is JAVA.
It allows programs to be independent from the PC on which they have to be executed. All java codes are interpreted by a particular platform, installed on all computers with the browsers, that create the executable file for specific PC on which it has to be run. It allows to create a singular program for all the different operating systems.
On the web, we can find viruses, spammer programs and people that enjoy connecting to a specific user’s computer, too. For this reason, it is important to install an antivirus and a firewall on every computer, before the first connection to the internet. Every day, a lot of computers are infected by a new virus, or are the victims of a hacker’s attack, but if you have a good antivirus and a good firewall, you couldn’t be infected by them.