Light intensity and voltage

Please explain me the working of voltage resistance and light intensity i am not able to understand.

let me explain
We as you can see from the tutorial connect LDR sensore by 3.3v pin and analog pin (A0), so that when intensity of light increases, the resistance of LDR decreases so as the result the voltage across the LDR decreases and as a result, the voltage on the analog input pin also increases. what This tells us is as ** the light intensity increases, the voltage on the analog input pin also increases as a result** . The Bolt then converts that the voltage a 10 bit (10 places in binary number system) digital value that varies from 0-1024 (0 to 2 raised to 10).This digital data is finally then sent to the cloud where it is plotted for visual representation.
hope this helps
.thank you