What Is Internet ?
The Internet, sometimes called simply "the
Net," is a worldwide system of computer networks - a network of networks
in which users at any one computer can, if they have permission, get
information from any other computer (and sometimes talk directly to users at
other computers). It was conceived by the Advanced Research Projects Agency
(ARPA) of the U.S. government in 1969
and was first known as the ARPANet. The original aim
was to create a network that would allow users of a research computer at one
university to "talk to" research computers at other universities. A
side benefit of ARPANet's design was that, because messages could be routed or
rerouted in more than one direction, the network could continue to function
even if parts of it were destroyed in the event of a military attack or other
disaster.
Today, the Internet is a public, cooperative and
self-sustaining facility accessible to hundreds of millions of people
worldwide. Physically, the Internet uses a portion of the total resources of
the currently existing public telecommunication networks. Technically, what
distinguishes the Internet is its use of a set of protocols calledTCP/IP (for Transmission Control
Protocol/Internet Protocol). Two recent adaptations of Internet technology, the intranetand the extranet, also make use of
the TCP/IP protocol.
For most Internet users, electronic mail (email) practically
replaced the postal service for short written transactions. People communicate
over the Internet in a number of other ways including Internet Relay Chat
(IRC), Internet telephony,instant messaging, video
chat or social media.
The most widely used part of the Internet is theWorld Wide Web (often
abbreviated "WWW" or called
"the Web"). Its outstanding feature is hypertext, a method of
instant cross-referencing. In most Web sites, certain words or phrases appear
in text of a different color than the rest; often this text is also underlined.
When you select one of these words or phrases, you will be transferred to the
site or page that is relevant to this word or phrase. Sometimes there are
buttons, images, or portions of images that are "clickable." If you
move the pointer over a spot on a Web site and the pointer changes into a hand,
this indicates that you can click and be transferred to another site.
Using the Web, you have access to billions of pages of
information. Web browsing is done with a Web browser, the most popular
of which are Chrome, Firefox and Internet Explorer. The
appearance of a particular Web site may vary slightly depending on the browser
you use. Also, later versions of a particular browser are able to render more
"bells and whistles" such as animation, virtual reality, sound,
and music files, than earlier versions.
The Internet has continued to grow and evolve over the
years of its existence. IPv6, for example, was
designed to anticipate enormous future expansion in the number of available IP addresses. In a related
development, the Internet of Things (IoT) is the burgeoning
environment in which almost any entity or object can be provided with a unique identifier and
the ability to transfer data automatically over the Internet.
How to Used iTunes' Music Videos ,Library
iTunes' Music
Library is like a master list of your digital media. To view the Music Library,
select the Music entry in the left-hand column of the iTunes player. From here,
you can browse the music you have collected, find a song, add or remove songs,
and watch video.
iTunes can display your Music
Library in three ways. By default, the application uses the list view, where
each song is one entry. Click the second View button (at the top of the iTunes
window) to group tracks together by album artwork in grid view. Click the third
View button, and you’re browsing by album cover in cover flow view, complete
with reflective surface!
Perform these basic
tasks from your Music Library:
·
Browse the Library: After you add a few dozen songs to iTunes, viewing the Library
can become a task. To help out, iTunes can display your Library in browsing
mode: just click the View menu and click the Show Browser item, or press the
Command+B keyboard shortcut.
iTunes' Browse mode organizes your tunes into four sections:
·
Artist
·
Album
·
Song Name
·
Remove old music from the Library: After you spend some time playing songs with iTunes, you might
decide that you didn’t really want to add 40 different versions
of “Songs” to your Library. To remove a song from the Library, click the song
to select it and then press the Delete key on your keyboard.
·
Watch video: Watching video in iTunes is similar to
listening to your music. To view your video collection, click one of these
entries in the Source list:
·
Movies
·
TV Shows
iTunes displays your videos as thumbnails or in cover flow view. Music
videos appear as a smart playlist.
From your collection,
you can
·
Double-click a video thumbnail or an entry in the list.
·
Drag a QuickTime-compatible video clip from the Finder window to
the iTunes window.
iTunes plays video in the box below the Source list or in full-screen
mode, depending on the settings you’ve chosen on the General pane in the iTunes Preferences window. In
full-screen mode, move your mouse to display a control strip at the bottom of
the screen, sporting the standard slider bar that you can drag to move through
the video (as well as a volume control and Fast Forward/Reverse buttons). You
can also pause the video by clicking the Pause button.
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