The document discusses various internet services, highlighting the importance of e-mail, MP3 music downloads, videoconferencing, e-commerce, downloading software, and additional online services. It describes how each service transforms communication, entertainment, business transactions, and information access in modern life. The content emphasizes the convenience and efficiency of these technologies in daily activities.

1. Internet ServicesInternet Services

2. 1. E-mail1. E-mail
Electronic mail or e-mail is the most widelyElectronic mail or e-mail is the most widely
used and most common network service.used and most common network service.
In the past, we had to wait days to receiveIn the past, we had to wait days to receive
a letter from abroad, but now we needa letter from abroad, but now we need
only a few minutes or even seconds. Thisonly a few minutes or even seconds. This
service allows us to send text, picture orservice allows us to send text, picture or
sound files in a very easy and simple way.sound files in a very easy and simple way.
Quick messages can be transmittedQuick messages can be transmitted
between two people or among groups.between two people or among groups.

3. 2. The MP32. The MP3
 No doubt this service has become one of theNo doubt this service has become one of the
most used by netizens (citizens who surf themost used by netizens (citizens who surf the
Internet), especially children and young people.Internet), especially children and young people.
 An MP3 is an audio compression system withAn MP3 is an audio compression system with
which we can store music with the same qualitywhich we can store music with the same quality
as a CD, but in much less space.as a CD, but in much less space.
 It allows us to download all kinds of sound orIt allows us to download all kinds of sound or
music files to our computer, that is, if we want tomusic files to our computer, that is, if we want to
have the song from our favorite band on ourhave the song from our favorite band on our
computer, we just have to enter some of the sitescomputer, we just have to enter some of the sites
that offer this service, choose what interests usthat offer this service, choose what interests us
and download it to our computer. We will be ableand download it to our computer. We will be able
to listen to songs whenever we want.to listen to songs whenever we want.

4. 3 Videoconferencing3 Videoconferencing
 If you were a journalist and had to interviewIf you were a journalist and had to interview
someone who lives thousands of miles away, yousomeone who lives thousands of miles away, you
would typically take a plane and spend severalwould typically take a plane and spend several
hours in the air to get to your interview.hours in the air to get to your interview.
However, with this system, it is no longerHowever, with this system, it is no longer
necessary, because you can do it from yournecessary, because you can do it from your
home, office, college or university, without havinghome, office, college or university, without having
to travel outside the country.to travel outside the country.
 Videoconferencing is a communication systemVideoconferencing is a communication system
specially designed for remote meetings, allowingspecially designed for remote meetings, allowing
us to see, hear and talk to people from all overus to see, hear and talk to people from all over
the world in real time. In addition, we can sharethe world in real time. In addition, we can share
all kinds of information from documents toall kinds of information from documents to
images, pictures and video.images, pictures and video.

5. 4*4*
 There are several models and brands of video equipment, suchThere are several models and brands of video equipment, such
as:as:
 - Personal equipment: Where the system is installed on the- Personal equipment: Where the system is installed on the
computer.computer.
 - Group equipment : They are larger systems because they can be- Group equipment : They are larger systems because they can be
connected to one or two 27-inch monitors, so that several peopleconnected to one or two 27-inch monitors, so that several people
can participate in the videoconference.can participate in the videoconference.
 The elements of a videoconferencing system are:The elements of a videoconferencing system are:
 - CODEC (Encoder / Decoder, or also Compressor /- CODEC (Encoder / Decoder, or also Compressor /
Decompressor). Converts video and audio signals into digitalDecompressor). Converts video and audio signals into digital
signals, considered the core of the videoconferencing system.signals, considered the core of the videoconferencing system.
 - Device Control: Controls the CODEC and peripheral equipment- Device Control: Controls the CODEC and peripheral equipment
system.system.

6. 4*4*
 - House robotics are included in any equipment. They are handled by the- House robotics are included in any equipment. They are handled by the
control device.control device.
 - Microphones: Responsible for capturing the audio that is sent to the- Microphones: Responsible for capturing the audio that is sent to the
recipient.recipient.
 - Monitors: To observe those involved in videoconferencing and any type- Monitors: To observe those involved in videoconferencing and any type
of image you want to display.of image you want to display.
 - Software videoconferencing system, which allows the joint action of all- Software videoconferencing system, which allows the joint action of all
the elements named.the elements named.
 - Communication device: The digital signal coming from the CODEC and- Communication device: The digital signal coming from the CODEC and
sent by the transmission channel.sent by the transmission channel.
 - Transmission channel: Signal that can transmit audio and video to- Transmission channel: Signal that can transmit audio and video to
another place in the world. It can be coaxial cable, microwave, opticalanother place in the world. It can be coaxial cable, microwave, optical
fiber, satellite, etc..fiber, satellite, etc..
 - Space: To be conditioned for a good sound, lighting equipment- Space: To be conditioned for a good sound, lighting equipment
installation and to conduct the sessions.installation and to conduct the sessions.

7. 5. The e-commerce5. The e-commerce
 The e-commerce allows all kinds of transactions andThe e-commerce allows all kinds of transactions and
purchases over the Internet.purchases over the Internet.
 The main advantage of this service is that the online storesThe main advantage of this service is that the online stores
have no schedule, so we can buy anything we wanthave no schedule, so we can buy anything we want
anywhere in the world, at any time without leaving ouranywhere in the world, at any time without leaving our
home.home.
 We pay with credit cards and the office is at home, so it’sWe pay with credit cards and the office is at home, so it’s
an easy way to buy things.an easy way to buy things.
 It's a real store, because we can stroll around the page,It's a real store, because we can stroll around the page,
window shopping as if we were in a mall. Then we selectwindow shopping as if we were in a mall. Then we select
what we like and finally, we buy what we want.what we like and finally, we buy what we want.

8. 6 Download programs6 Download programs
 On the Internet, there are several places from which weOn the Internet, there are several places from which we
can obtain the latest types of software being used andcan obtain the latest types of software being used and
download them directly to our computer.download them directly to our computer.
 Of all that we can get in terms of software, there are twoOf all that we can get in terms of software, there are two
types: shareware and freeware.types: shareware and freeware.
 Shareware has an economic value, but we can downloadShareware has an economic value, but we can download
and use it free for a certain period of time, as a kind ofand use it free for a certain period of time, as a kind of
test. If after that time the program is to our liking, we cantest. If after that time the program is to our liking, we can
buy it directly on the same page. Otherwise, it will losebuy it directly on the same page. Otherwise, it will lose
certain properties or it can expire and cannot be reused.certain properties or it can expire and cannot be reused.
 Freeware, however, is free, so its use is unlimited.Freeware, however, is free, so its use is unlimited.

9. 7. Other services7. Other services
 The Internet is a practically infinite,The Internet is a practically infinite,
we can find everything from thewe can find everything from the
history of a country to a recipe. Buthistory of a country to a recipe. But
as the space available here is notas the space available here is not
very large, only some of the mostvery large, only some of the most
important services are shown.important services are shown.
However, in addition to thoseHowever, in addition to those
aspects already mentioned, there areaspects already mentioned, there are
others that can be found on the netothers that can be found on the net
which are very useful.which are very useful.

10. 8. Images8. Images

11. Óscar Castro GarcíaÓscar Castro García
3 ESO A3 ESO A