Internet is a technology of connecting multiple computers
together through a network. There are various types of network that combine to
make the internet. Various types of small networks include Local area network (LAN),
Personal area network (PAN), Metropolitan area network (MAN), Campus area
network (CAN), etc. There is also a wide area network (WAN) which is a larger
type of network also known as the internet.
By using internet users can send and receive messages over a
network. Suppose you want to share a picture of yourself with your friends then
you can simply upload your picture on the internet and your friends start
liking and commenting on the picture. There are plenty of social networking
sites on the internet. Some of the popular social networking sites include
Facebook, Instagram, Pinterest, Twitter, and WhatsApp. You can create a free
account on these sites and start sharing your thoughts over the internet.
Internet uses different rules/standards for communicating devices that are known as
TCP/IP. TCP is a short form of
Transfer control protocol while IP
is a short form of Internet protocol. TCP/IP was introduced in 1970. One
feature of the internet is using electronic mail that was first time used in
1980. In 1990 World Wide Web (www) technology is launched. World Wide Web is
used to make websites and display images, text, videos, animation on the
screen. In 1970 DARPA (Defense advanced research projects agency) developed
ARPANET which was used as a WAN to connect computers. Finally, from 1995 to
onwards, the internet was accessed worldwide.
Now you may be thinking that how the internet works. Your
computer sends/receives signals to/from ISP (Internet service provider). To
send and receive signals from ISP we use the modem. The modem is a device which
converts digital signal to analogue signal and analogue signal to digital
signal. Data in our computer is in digital form and the medium we use to transfer data is in analogue form. Different types
of medium are used e.g. telephone line, coaxial cable, fiber optics, etc. We
use a modem as a conversion device
between our computer and ISP.
We use different ways to connect to the internet and the
ways or types of connecting to the internet are described below.
Types of the internet:-
Dialup connection: It
is an old way of connecting to the internet. Dialup connection uses a phone
line and is very slow. You can either make a call on the phone or connect to
the internet. The connection time is high in dialup connection. The internet
speed is also very slow. You cannot do video/audio chat on this type of
connection. Also downloading any file is very slow. Nowadays this type of
connection is not used.
Leased line: Leased
line is a dedicated phone line used to connect to the internet. A leased line
is used by big organizations. Some universities still use a leased line for
making a connection to the internet.
ISDN (Integrated service digital
network): In this type of internet you can connect a computer,
fax machine or telephone line to single ISDN. ISDN uses a modem to connect
different devices. ISDN is costly than Dialup connection. You can transfer
video, audio, and other data at the same time i.e. you can make a phone call from
your telephone and also can use the internet at the same time.
DSL (Digital subscriber line):
DSL uses the modem for making an internet connection. It is 10 times faster
than a dialup connection. Also, the voice quality of telephone is not affected
when you use the internet at the same time.
ADSL (Asymmetric digital subscriber
line): It is mostly used type of DSL and in this type of
connection, download internet speed is high than upload internet speed. Mostly
you use the internet for downloading data. And we upload files less.
SDSL (Symmetric digital subscriber
line): This is also a type of DSL but it has almost same
download and upload speed.
Cable modem: In this
type of network you can connect modem with TV cable and internet.
Wireless or Wi-Fi:
Wireless connection is the most common type of internet connection by which you
can connect laptops, smartphone, and other digital devices with the internet.
The internet speed of Wi-Fi ranges from 5Mbps to 20 Mbps. Wi-Fi uses radio
frequency to transfer data.
Broadband: This is a very
high-speed internet with a transfer rate of 100Mbps. The internet speed depends
upon the cables i.e. coaxial cable or fiber optics. Coaxial cables loss some
data during transferring data.
Satellite: In this
type of internet you can make a connection with the satellite but it has low
internet speed i.e. 513 kbps to 2Mbps
Cellular: This type of
internet connection is given by mobile companies to its users. The cellular
connection uses 3G (3rd generation) and 4G (4th
generation) technologies. 3G gives around 2Mbps speed while 4G gives speed up