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Category: Definition

Definitions of terms used within Learning Glue

Class Variables

Class Variables

Class variables (or static variables) are declared with the static keyword within in a class, but outside a method. There can only one version of a class variable within a class and it will be shared with all instances of that class. If changes are made to a class variable, all other instances will also change.

Instance Variables

Instance Variables

Instance variables belong to the instance of a class or object and are declared within in a class, but outside a method. Every instance of a class with an instance variable will have its own copy of that instance variable. As instance variables are independent, if you make any changes to a variable those changes are not reflected in other instances of that class.

XML sitemap

XML sitemap

Think of an XML sitemap as a road-map for a website that is used primarily by search engines to quickly understand the structure of your site and navigate to its important pages. A well constructed XML sitemap can improve for SEO by providing search engines routes to quickly find important pages on your website.

SSL

SSL

Have you ever visited a website that uses https:// in the URL rather than http://? If you think not you should have another look at the URL for this page… there it is! You have been using SSL, or Secure Sockets Layer, without even knowing it. So what is SSL and why does it matter? SSL stand for Secure Sockets Layer and it is a technology that facilitates an encrypted connection between a web server or host, and a web browser or…

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PHP

PHP

PHP (PHP: Hypertext Preprocessor) is a popular open source general-purpose server side scripting language that is especially suited for web development and can be embedded into HTML.

Protocol

Protocol

A protocol is a procedure or system of rules – in computer science, a protocol is a set of rules used by computers that are connected together on a network. The Transmission Control Protocol/Internet Protocol, commonly known as TCP/IP, is a common method to interconnect computers that form a computer network. It is across this type of network that FTP is used to transfer files from computer to computer.

FTP

FTP

FTP stands for File Transfer Protocol. You have probably heard of FTP and it is very likely that you have used it without even realising, but do you know what FTP is? Well, you’re still reading this so I guess the answer to that question is either a flat out no or a maybe, kinda, sorta but tell me anyway. FTP is a safe, efficient and flexible way to  move (or transfer)  data (or files) from one computer to another using a…

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Client

Client

A client is a piece of computer hardware or software that accesses a service made available by a server. The server is often (but not always) on another computer system, in which case the client accesses the service by way of a network.

Server

Server

There are many different types of servers, for example: File server: a computer and storage device dedicated to storing files. Any user on the network can store files on the server. Print server: a computer that manages one or more printers, and a network server is a computer that manages network traffic.

TCP/IP

TCP/IP

TCP/IP, or the Transmission Control Protocol/Internet Protocol, is a suite of communication protocols used to interconnect network devices on the internet. TCP/IP can also be used as a communications protocol in a private network (an intranet or an extranet).