Printing generally means putting words and numbers on the computers screen. Your first program should have been "Hello World" or something similar. One version is:
print "Hello World"
The process can get a bit more complicated when you want to format the output in some special way ( think about the different ways that dates can be printed ) or when you want the output to go to some place other than the Python console. Often you want to print a string, and manipulating the string is closely related to the process of printing.