Without going into detail here, they function to distribute free software, information and allow simultaneous real time conversations between dispersed participants. These tools are still valuable but their functions tend now to be 'buried' in other more sophisticated software packages and are thus hidden from view. Every user needs access to the Internet by means of a 'member' computer. Many professionals choose to do this by means of a personal computer, a modem and a telephone connection to an Internet 'host' computer. Each, though, provides a 'pipe' between the Internet and the user's machine.
Connections come in many gradations of quality.
Since faster is better, faster also tends to involve more expense. Obviously, the quality and quantity of high technology infrastructure available to the user is a function of the national wealth of his or her country. Once 'there', you can easily locate free learning materials to further develop your skills. However, getting 'there' is still a formidable hurdle. While it is possible to buy printed reference material, it is best to learn from an experienced user.