Useful terms



Bandwidth are terms used to refer to various bit-rate measures, representing the available or consumed data communication resources expressed in bits per second or multiples of it (bit/s, kbit/s, Mbit/s, Gbit/s, etc.).


Latency is a measure of time delay experienced in a system, the precise definition of which depends on the system and the time being measured. In communications, the lower limit of latency is determined by the medium being used for communications.


Preloading data into a reserved area of memory (the buffer). In streaming audio or video from the Internet, buffering refers to downloading a certain amount of data before starting to play the music or movie.

Mobile Devices

QR Code (Quick Reference Code)

QR Code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional code) first designed for the automotive industry. More recently, the system has become popular outside the industry due to its fast readability and large storage capacity compared to standard UPC barcodes. The code consists of black modules (square dots) arranged in a square pattern on a white background.

Way of connectivity to the internet from your mobile

  • WiFi
  • 3G
  • 4G

Disadvantage of using infra-red to transfer data

  • It is slower
  • You have to have the device in sight - no walls or items in the way.

Online Security


Phishing is the act of attempting to acquire information such as usernames, passwords, and credit card details (and sometimes, indirectly, money) by masquerading as a trustworthy entity in an electronic communication. Communications purporting to be from popular social web sites, auction sites, online payment processors or IT administrators are commonly used to lure the unsuspecting public. Phishing emails may contain links to websites that are infected with malware. Phishing is typically carried out by e-mail spoofing or instant messaging, and it often directs users to enter details at a fake website whose look and feel are almost identical to the legitimate one.

Why do we have drop down boxes on secure websites for pass codes instead of typing in pass numbers?

It is harder to hack because they can track what keys you have pressed, so if it is just mouse clicks it is safer.

Key stroke software remembers what keys you have pressed. This can be good because it keeps track of what users have typed however if a hacker uses this software they can use it for their own gain.