What should all technology know

Internet for beginners

A worldwide network

The internet is worldwide Computer networkthat enables us to call up information at almost any place at any time. Theoretically, it is possible to connect to any computer in the world via the Internet, provided that it also has an Internet connection.

This large network consists of many individual networks. At home you use the network of the Providers, a service company that provides the user with access to the Internet. Internet providers in Germany include Deutsche Telekom, Vodafone and Unitymedia.

In addition to the freely accessible Internet, there are also networks that are only reserved for certain users. In the company's own Intranet information is made available to employees that is not intended for the public. For larger companies, institutions and authorities in particular, this is often the easiest way to make internal developments and news quickly accessible to every employee.

This is how the internet works

The words World wide web and the Internet are often used interchangeably. In fact, that's wrong. The internet itself is only the basic structure. It provides the infrastructure through which various services can be made available to the user.

One of these services is the World Wide Web. With a Web browsersuch as Firefox, Chrome or Internet Explorer, websites can be displayed. These websites are on servers and can be accessed from there at any time.

If you want to look at the Planet-Wissen website, you have to type the name of the page in the address line of the browser: http://www.planet-wissen.de. The abbreviation http stands for "Hyper Text Transfer Protocol" and forms the transmission standard of the WWW.

HTTP works on the question-and-answer principle. The user's computer sends a request for a page to the provider's server. The provider forwards the request via nodes in the network, which convey the exact route to the location of the website.

At some point the request hits the target server on which the requested data is located and which is sent back from there. The internet user can then view the selected website.

A server is a memory on which the content of websites, e-mails or files is stored. In addition, a program is installed there that allows access to the data on the server. search engines, for example, Google, Yahoo or Fireball can search through the content of websites and filter out the information that the user has entered in the search mask.

The internet at home

In order to be able to connect to the Internet at home, you need a modemthat is connected by cable to the telephone or cable connection. Most Internet providers supply a modem with the conclusion of a contract that works with DSL (Digital Subscriber Line).

Older systems such as ISDN (Integrated Service Digital Network) or the analog modem, on the other hand, only offer medium to slow surfing speeds.

The PC is either wired or wireless (WIRELESS INTERNET ACCESS) connected to the modem. A wireless, radio controlled connection to the Internet is possible via WLAN (Wireless Local Area Network). In many caf├ęs, at airports, universities and train stations there are WiFi networks that everyone can use freely. About this so-called "Hot spots" you can comfortably surf the Internet with your tablet, smartphone or laptop - at no additional cost.

If there is no public WLAN network, the smartphone used UMTS (Universal Mobile Telecommunications System) for a long time, which is now the new standard LTE (Long Term Evolution). With LTE, it is possible to connect to the Internet at any location via the nearest cell tower.

Security on the Net

Whether online banking, auctions or a last-minute gift - you can do a lot of things on the Internet from the comfort of your own home. Online shops offer almost everything you need for daily life. Furniture, clothing, electrical appliances and even groceries can be ordered here.

Thanks to the Internet, you can now save yourself the trip to the video store. Films can be rented or streamed via special platforms. Computer programs, graphics, music files, train tickets and plane tickets are also offered for download.

But anyone who surfs the Internet should protect their computer and network. Depending on which pages you are on, you can quickly catch a virus or trojan. These programs, Malware called, install themselves on the PC - usually without noticing anything. They spy on passwords, rummage through private files or paralyze the entire system.

Hence, it is important to keep your computer up to date Virus programs and regularly check for malicious software.

Wireless networks should also be encrypted directly on the router. The most common method is WPA2 encryption (Wi-Fi Protected Access). This measure prevents unauthorized persons from gaining access to the network and accessing private data.