World War Two and Comfort Woman??

What is all this? Ive been seeing this stuff in the internet everywhere about Japan doing bad stuff to Korea and China. In my school in Osaka, my teachers taught me about us building a strong foreign relationship with our neighboring countries. I figured that my teachers were correct but at the same time i believe in some interent stuff because of the pictures, and the fact that my parents hate chinese people. The pictures are just terrible, are they real? ANd whats all this comfort woman, when did we ever have a World War two????????????