the code is being used to display text on a 8x80 led Matrix, currently it is displaying the word "hello". Each of the data arrray are used to display an individual letter and is shifted out by this section of code below:
shiftOut(redData, clockPin, MSBFIRST, dataArray);
shiftOut(redData, clockPin, MSBFIRST, dataArray);
shiftOut(redData, clockPin, MSBFIRST, dataArray2);
shiftOut(redData, clockPin, MSBFIRST, dataArray3);
shiftOut(redData, clockPin, MSBFIRST, dataArray4);
shiftOut(redData, clockPin, MSBFIRST, dataArray4);
shiftOut(redData, clockPin, MSBFIRST, dataArray1);
shiftOut(redData, clockPin, MSBFIRST, dataArray);
shiftOut(redData, clockPin, MSBFIRST, dataArray);
shiftOut(redData, clockPin, MSBFIRST, dataArray);
each line above represents 1 8x8 led matrix and is displaying a 'H' on line 3, 'E' on line 4 etc.