what is technology s-curve?

Answer 1

From wikipedia http://en.wikipedia.org/wiki/S-curve :

"The S-curve is often used to describe how new technology is adapted. Initially people are slow to begin to use the technology but once it is accepted growth is rapid. Finally, growth slows down when the market is saturated and/or newer technology comes along."

It can also represent the reliability of a new product, which may be initially low ("infant mortality") then start rising until it flattens out to a high level ("mature product").