Computer jargon - "Bandwidth", explain the term in simple words. What is the unit of measurement of bandwidth?

Bandwidth
Bandwidth refers to the amount of data that can be transferred from one place to another within a certain amount of time. Digital devices measure bandwidth in bytes per second. The bigger the bandwidth, the faster the data can be transferred.

Internet jargons - What is the difference between Wi-Fi and Wiki

Wi-Fi
Wi-Fi is short for “wireless fidelity”. This refers to certain kinds of wireless local area networks. People with handheld devices such as Blackberries or iPhones, or laptops with wireless cards can connect to the internet using a Wi-Fi network.

Wiki
A wiki is a website or piece of software that allows users to create and edit webpages. Users are able to link to outside sites and collaborate on the information that is posted.

Virus, Spyware and Spam, differentiate between them with respect to information and computer security

Virus
A virus is a piece of code that copies itself without help from users and is usually attached to a program or files that can be downloaded. Some viruses display messages, install other software or files, or delete information.

Spyware
Software that is installed on your computer without your knowledge or consent, usually when other software is being installed, is often referred to as spyware. Most try to get the user to look at advertisements or certain websites. Some spyware sends information about the user to other computers over the Internet.

Spam
Spam is email that users receive when a mailing list is used inappropriately and a message is sent to a large number of people who didn’t ask to receive it.

Explained in simple terms. What is the difference between Social Networking and Social Bookmarking?

Social Networking
A social networking site allows you to identify your contacts and establish a link between you and each of your contacts.

Social Bookmarking
The practice of sharing and bringing links to content that you find of value to the attention of others. Sites such as Digg, Facebook and Orkut are popular variations of this type of link sharing.