Dial-up or dial-in - Name a type of connection or an act of connection to the Internet through the establishment of a call (phone - dial) to a server through a modem.

USA is the term "dial-up simple" to describe a direct connection through a telephone line and a modem, a computer under the same conditions. Allows such a connection and access to an extranet.

Regarding access to the Internet itself, is a protocol used for connections, or SLIP (Serial Line Internet Protocol) or PPP (Point-to-Point Protocol) - Today, the PPP is the most popular method of access.

It is worthwhile to understand the following, which goes unnoticed to most users of the Internet: After being connected, and while we are connected (a few privileged whose computers are always connected ...), we are not merely to access the Internet. Our computer obtained by the protocol of connection, a specific address (a temporary IP address, time of our connection) and becomes an integral part of the Internet. In fact, if you installed software on our server machine, even if very simple, we can even allow other people in another part of the world, provided that you also are connected, can go directly to our computer and even allow for example to print a document that is on your computer's hard drive them on a printer in our house.

Naturally, the pirates of software (and digital music, and the imaginable, and unimaginable) often use this type of facility to achieve its purposes. Establish a connection, check the IP address was assigned to them (as the connection is not permanent, do not have a domain), inform the party via e-mail or through a newsgroup, and while the connection is maintained, is bored vilag.

One note: chosen to illustrate the situation in the preceding paragraph, an illegal use, pedagogically because usually work best (when you talk about something that is illegal, immoral or fattening, attention is immediately more active ...), but strongly advise not going to go commit illegalities. Moreover, it commits illegalities at least consciously, or not to run slowly.