The internet is a collection of a large number of client-server based systems. So all files and other resources on it are stored on secondary storage devices of the respective servers. Servers of websites are termed as web servers. So when you type in a URL of a website in the address bar of your browser, it makes a connection to that web server which in turn fetches the data from the secondary storage device (such as the hard disk) that they must be using and returns it to the respective browser. The same holds true for any other resource (image, MP3 file, zipped file, etc.) that you access on the internet.

QWERTY keyboard (also known as universal keyboard) is used in modern computers. The name QWERTY comes from the first six letters in the top row. It was invented by C L Sholes in 1872.

Screen slaves refers to people who are abnormally addicted to the computer. For example, screen slaves would communicate via e-mail with people sitting right next to them. The screen slave culture, which is particularly rampant in offices the world over, is adding to the sedentary lifestyle of white collar workers, thereby increasing related disorders such as obesity, heart disease and Repetitive Stress Injury.

Thin Film Transistor (TFT) Liquid Crystal Display technology does away with the traditional bulky Cathode Ray Tube (CRT). LCDs use a strong backlight as the light source and control how much of this light is allowed to reach the dots (pixels) by selectively allowing the light to reach each pixel. LCDs achieve this by taking advantage of a key property of ‘twisted’ liquid crystal molecules; their ability to naturally block polarised light but then let it through by degrees when a small electric field is applied. LCD cells are accurately controlled and arranged in a flat matrix of rows and columns.

Practically, both are same. An inverter converts DC power supply into AC supply. A UPS (Uninterupted Power Supply) is an electronic device which uses inverter technology in it. UPS uses AC supply when power is there, converts into DC power and stores it. This DC power is converted back to AC supply and provides stand by power when electricity goes off.

All obsolete electronic devices such as computers, servers, printers, monitors, TVs, cellphones, calculators, CDs, floppies, chips, processors, motherboard, PCB etc. end up as e-waste. E-waste contains many hazardous substances like PVC, plastics, heavy metals, Brominated Flame Retardants etc.