What is Erlang

Erlang is the unit for measuring the traffic of resources in telecom field.

If the Resources is used for 60 min in 1 busy hour than we can say that the there is 1 erlang traffic in that resources.
So 1 Erlang is the 100% usage of the ressources.
If You are getting 10 Erlang traffic in your node than simply u can say that u have 60 subscriber in that perticular node for last 1 busy hour and each subscriber talked for 10 mins.
If two operator in your company using the phone line for whole hour than u can say u have 2 Erlang traffic for that phone line.
So Erlang shows the demand of the resources.

What is Sun Cheaters?

Direct Sun light sometimes irrites our eyes, Also it is very important to protect our eyes from the UV radiation of the sun light.

The protective way to work in a outdoor condition is to wear a branded sunglasses to protect your eyes.
The lenses of glass can be coloured or darked or polarised.
And these sun glasses were called Sun Cheaters in early 20th century, So Cheaters is a slang in Amarican English language for Glasses.

Using Sun glasses can help you for preventing many dollors to waste in laser eye treatment.

What is the difference between NIFTY and Sensex

Both the NIFTY and Sensex are the indexs used for showing the advances or decline in the Share Market.
Nifty shows the trend of main companies of National Stock Exchange(NSE), whereas the Sensex is the indecator for the Main companies of Bombay stock Exchange (BSE).

Nifty is less expanding index than Sensex ,So less volatile compare to Sensex .

Nifty is more reliable than Sensex too as it is less prone to momentum of the Market.