World Wide Web / HTML

World Wide Web

• This presentation will be about the World Wide Web. The World Wide Web is the content on the internet. This includes the web pages, files and other data. This presentation will include;
• Hyperlinks
• Web Servers
• Wizard
• Browsers

Hyperlinks

• Description
• A link (which can be
• text or a graphic) which takes
• you to another web page or
• location within a document.
• https://www.youtube.com/watch?v=qcjBrEvwIE4 (Einbetten)

Web Servers

• Description
• It is the job of a
• web server to deliver web pages
• to users’ computers.
• https://www.youtube.com/watch?v=wukg_do5AV4 (Einbetten)

Wizard

• Description
• A sequence of dialog
• boxes which lead the user
• through a series of well-defi ned
• steps.
• 

Browser

• Description
• A computer program with a graphical user interface for displaying HTML files, used to navigate the World Wide Web.
• https://www.youtube.com/watch?v=BrXPcaRlBqo (Einbetten)

HTML'S

• To finish of the presentation i will be presenting HTML'S. HTML (Hypertext markup language) is the language used to create web pages. I will be talking about;
• HTML tags
• Examples of HTML'S

HTML tags

• HTML is made up of tags, Most of them are in pairs. Pairs of tags are called HTML ELEMENTS. The open tag is written between triangular brackets .
• Most tags also have a close tag, which is the same as an open tag but includes a forward slash e.g text
• Some more examples of HTML tags.
• - Bold
• - Italic
• - Paragraph
• - Image
• - Hyperlink
• - List
• - Bullet

Examples of HTML.

• Here is a section of HTML from a web page. The image on the right shows how it would be displayed.
• Welcome to my page
• I go tohttp://www.glenview.ac.uk" >
• Glen View High School
• my hobby is football.

Web server

• It is the job of a web server to deliver web pages to users’ computers.
• https://www.youtube.com/watch?v=54n_iXocB6o (Einbetten)

HTML element

• An individual component of a HTML document.
• 

URL

• A URL is a (uniform resource locator) it is an address for a web page.
• https://www.youtube.com/watch?v=SMxx9XEF6m0 (Einbetten)

HTML

• Html is a (hypertext markup language). It is the language used to create web pages.
• 

Search engine

• Search engines are websites which allow users to find data on the internet.
• https://www.youtube.com/watch?v=DA1mooP1J30 (Einbetten)

Simple Mail Transfer Protocol

• The internet standard used for sending messages across IP networks in server-to server transfers. Also used by email users to send a message to an email server.

Post Offi ce Protocol 3

• Used to retrieve emails from an email server over a TCP/IP connection. This is the most widely used email retrieval protocol. Normally users download emails to their local computer using POP3, deleting them from the email server.

Internet Message Access Protocol

• This is the other popular email retrieval protocol. Normally users work on the emails as they reside on the email server using IMAP and do not download them.

Hack

• When you use illegal means to access someone’s email account or computer system.

Cc

• Stands for carbon copy. You can copy in additional email recipients using this field.

Bcc

• Stands for blind carbon copy. You can copy in people to emails – but hide their identify and email address from other recipients – by entering them in this field.

Attachments

• A file or document which you can attach and send with an email.

Address book

• An email tool which allows you to store the names, email addresses and contact details of people.

Store and forward

• When an email is sent, it is stored on an email server and remains there until the recipient accesses their email account. It is at this
• point when the server forwardsthe message to them.

CODEC

• codec – A device or program used to encode or decode data.

Peripheral

• Peripheral – Any device, such as a printer, attached to a computer to expand its functionality.

devices/components

• devices/components – Used as a generic term to mean computers, peripheral hardware, mobile telephones,
• manufacturing plant, environment monitors and many
• other things.

internet packets

• internet packets – A formatted block of data sent over the
• networks and the internet. A packet contains the addresses
• of send and destination, the data and error checking.
• https://www.youtube.com/watch?v=Tk8ehIY8_2A (Einbetten)

Byte

• In computing and telecommunications, a byte is unit of digital information which commonly consists of eight bits.(See page 19 for a definition of bits.)

USB

• A higher speed serial connection standard that supports low-speed devices (e.g. mice, keyboards, scanners) and higher-speed devices (e.g. digital cameras).

Client side processing

• When the interaction between a web page and code occurs directly on a user’s computer.

Server side processing

• When the interaction between a web page and a computer is processed through a server.

Simplex

• signals go in one direction at a time.

half-duplex

• Signals go in both directions to monitor and send instructions. They do not need to go at the same time.

full-duplex

• Signals go in both directions at the same time.

Bi-directional

• Bi-directional transmission has several meanings within data communication, but it is essentially about transmitting in both directions. Most recently the term has beenapplied to fi bre optics. Using the current technology, light passes in one direction only, so you have to add extra fi bres to the bundle to carry a signal in the opposite direction.

Packet switching

• Packet switching is a digital networking communications method that groups all transmitted data into suitably sized blocks, called packets, which are transmitted via a medium that may be shared by multiple simultaneous communication sessions.

database

• A collection of data stored in a structured way.

table

• A two-dimensional representation of data in a database.

record

• A group of selected data which are associated in some way.

field

• A single piece of data within a record.

primary key

• A single unique key used to identify each record in a table.

foreign key

• A field which can be used to cross-reference and access associated information across many tables.

SQL

• Structured Query Language (SQL) is a high-level language which is used to undertake this management activity.

DDL

• This is the part which is used to define the database structure.

DML

• This is the part used to add, delete, change and query the data which is held in the database structure.

DBMS

• Database management systems (DBMS) are the programs which allow you to create any database that you need and to use the databases you have created.

Physical barriers

• These include turning off computers and locking offices when the systems are unattended to prevent damage by people, the environment (e.g. fire, flooding, electrical interference) or theft.

Password control

• Passwords are sequences of characters, known only to the computer user, which allow access to a computer, network or application. Passwords should always be strong so that it is hard for someone else to guess them or work them out.

Access levels

• These can be set up to allow individuals to have access to only
• specific levels of an application and to prevent unauthorised users from accessing particular data.

Anti virus software

• This is set up to intercept computer viruses before they can
• become resident on the computer. The software can isolate the virus, remove it and sometimes repair any damage. Equivalent security programs exist for other types of malware.

Firewall

• This is a piece of software that monitors all data arriving at your computer from the internet and all data leaving your computer. It stops anything that it thinks is harmful or unwanted (such as viruses, spam, Trojan horses and hackers).

Encryption

• This is used to codify data so that it cannot be read by anyone who does not have the key to the code. An algorithm, sometimes known as a cipher, is applied to the data at the transmission end and the reverse is applied at the reception end.

backup

• Making a backup of data is the only way of recovering from a
• total data disaster. Many individuals and organisations back up data to Flash ® solid
• state storage devices or magnetic tape at night. The tapes are stored safely in a
• separate place, so that they are not destroyed by any disaster which could destroy
• the master system (fi re, earthquake, etc.). Many types of backup exist, including:
• Full system backup of all data held for a specifi c purpose.
• Incremental backups of fi les or data that has been changed since the last full
• backup. This is faster than running a full back up every time.
• Backups to removable media, such as a removable hard drive (if you have a large
• amount of data), USB sticks, CDs and DVDs.
• It is also possible to back up data across a network (or across the internet) to a server in
• a completely separate location (for example, backing up data to the cloud).