I bought 'Beginning Ardunio Programming and had a question regarding digital and analog signals. It says that,
"The Arduino ADC has a 10-bit resolution, meaning that it will return a linear value from 0 to 1023 corresponding to 0v and +5v respectively. With this resolution, the Arduino ADC can read levels of voltage down to 4.88 millivolts per level."
I am not sure how the first sentence (in blue) relates to the second sentence (in red).