Intro to Digital Information
The Web is a way to send and receive digital information. This information can come in the form of text, photos, audio, and even videos. These files can be measured in bits and bytes.
It’s important to know the weight of the files you download. Files are measured in bytes. As a general rule of thumb, you should never send an e-mail with an attachment larger than one megabyte. That way, you don’t clog the recipient’s server.
How Web Browsers Work
The chapter is divided into four sections, the first explaining how the Internet works. It’s important to note that the terms Internet and World Wide Web do not mean the same thing. The Web is not the computer’s network itself. It is the the way you access information through the network.
The Web’s server is what stores and distributes information over the internet. The Web’s browser is the software used to obtain and present information over the Web. Some browsers include Internet Explorer, Safari, and Firefox. Browsers do three things:
- Search and find information on Web servers
- Retrieves information and brings it back to you
- Renders the information for display on your computer
When a browser retrieves information for you, it makes a digital copy of that Web page, known as the cache, which is stored temporarily on your computer.
Using RSS
The second part of the chapter discusses RSS, an acronym for Really Simple Syndication. RSS allows you to subscribe to a feed of information (usually relating to one specific topic) that you can access direclty via the Web or an RSS reader.
According to Briggs, RSS is the most efficient way to view large quantities of information in an organized way.
Setting up an RSS Reader and subscribing to feeds can be done in three steps:
1) Select a reader: either web-based like Yahoo and Google or stand-alone readers such as NewsGator, FeedDemon, and SharpReader. Web-based readers are accessed from specific Web pages, while stand-alone readers are downloadable programs that you save to your computer and use afterwards.
For those who want the best of both types of readers, NetVibes and Google Reader are alternative options.
2) Find a Feed: Go to your reader and click which feed you want to subscribe to. If you have difficulty, you should upgrade your browser. If you can’t do that, obtain the RSS’s URL, which will probably end in “xml.”
3) Subscribe
FTP (File Transfer Protocol)
The third part of the chapter discusses File Transfer Protocol, which is a way of moving extremely large files that cannot be sent through e-mail.
As aforementioned, Briggs mentions that it’s generally unadvisable to send e-mail attachments larger than 1 megabyte because most network servers cannot handle them. FTP can be used to transfer these large files from one computer to another.
Some good FTP programs for Windows include FireZilla, Coffee Cup, and Ace. For Mac users, there are Fetch, Cute FTP, and Cyberduck.
In order to actually transfer these large files, after you download the software, you need to obtain the account information of the server your sending your file to.
HTML, CSS, and XML
The last part of the chapter covers the different codes for arranging text, audio, video, and other media on the Web. Basic Web pages are created with HTML code which is stored on the server. The code tells the browser how to display the media.
The commands used in HTML are called tags. Most of the tags used in HTML come in pairs, with one opening and another one closing the command. The same rules of HTML apply to images as well, but the tags are different. The <img src> tag is used when uploading pictures.
The next code used is CSS, or Cascading Style Sheets. CSS puts an emphasis on the creative aspect of Web design. With CSS, you can change the text’s font, color, size, and other qualities. You can CSS to augment what you already have selected with HTML. In between the <body> tags for HTML, you simply insert your H1 (heading 1) and ul (unordered list) tags to change how the text looks. For tutorials on how to do more: go to www.csszengarden.com
The last code used is XML, or extensible markup language. Like CSS, XML is not a replacement to HTML, it just augments it. Remember how the URLs for RSS feeds end in “xml?” That’s because most XML is used for RSS feeds. Http://xmlfiles.com is a great resources for using XML.