[header] How to distinguish nudism from pornography [title] Recognize and report child pornography. [step] Any images that show a child under the legal age in your country fully unclothed or partially clothed, in a sexual manner or for a sexual purpose, or acting out sexually for any purpose, are called child pornography and are illegal. If you find illegal images of children, whether on the internet or not, you need to contact the police. 
Child pornography is illegal because it is a crime and harms all children. It also distorts people's views on what is acceptable and what isn't.