What is downloading?
At a time when the Internet was invented, it was used in research and for military purposes. The first networks were small and terribly slow. Now, the situation has greatly improved. The majority of the population has computers and Internet access. A lot of us have more than one mobile phone, tablet or another device which can connect to the network. Also, the network is used for other things: watching videos, listening music and social media. It is so popular. Usually and from long time the Internet is used for download files. Every users of the Internet do it, but only a few know how it works. Download is a way to get data from Internet (e.g. from FTP server, WWW sites or P2P network). On the network it is possible to download a lot of files: documents, videos, audio files, pictures, etc. The very opposite of a download is an upload. It is the process of sending of files or another data to server or computer, which belong to another user. Usually, the connection link is conventionally divided for two channels: upload and download. The capacity of these channels (i.e. the maximum speed of data transfer) is measured in bits per second and multiple units. A link for the home (e.g. the ADSL, the cable TV, urban network) usually is an asymmetric but costs not a lot. Asymmetric means that upload (which is used to a sending data) capacity is undervalued relative to a download which is used for receiving data. For this reason, uploading is much slower than downloading.
How to download files?
It is possible to download files differently. First solution is from the network directly. Then in the web browser you can see a window with an inscription: downloading! The download progress is visible as percentages and it is possible to see the amount of downloaded data. It is very comfortable. The second idea is to download data from a server. It is the best solution when we want to download audio or video files. Of course, it is important to download multimedia files after paying for it. Internet is monitoring and administrators know, who download files and from where. The next solution is by dedicated sites like: Radidshare, Hotfile or Mediafire. Usually, data are pack, mostly as.zip or .rar file (for Linux users it could be .tar or .gz files).
Of course, it is important to extract it. One of my friends from dormitory, where I was an administrator asked me to send her photos from party of dormitory. Of course, I bundled one hundred files to .zip and send her via e-mail. After a few minutes I get the phone with such content: yes, I have got mail, but you did not send me photos, you sent me some books (read: books are a icon of .rar files).
The last form, which I would like to present is p2p. It is used programs like: Emule, Ares or BitTorrent. P2P has a one advantage: user can be a client and server at the same time!