Child pornography is commonly collected by pedophiles who use the images for a variety of purposes, ranging from private sexual uses, trading with other pedophiles, preparing children for sexual abuse as part of the process known as "child grooming," or enticement leading to entrapment for sexual exploitation such as production of new child pornography or child prostitution.
Pedophile viewers of child pornography are often obsessive about collecting, organizing, categorizing, and labeling their child pornography collection according to age, gender, sex act and fantasy. According to FBI agent Ken Lanning, "collecting" pornography does not mean that they merely view pornography, but that they save it, and "it comes to define, fuel, and validate their most cherished sexual fantasies." An extensive collection indicates a strong sexual preference for children and the owned collection is the single best indicator of what he or she wants to do. Researchers Taylor and Quayle reported that pedophile collectors of child pornography are often involved in anonymous internet communities dedicated to extending their collections. Pedophile online community bulletin boards (such as the defunct Dreamboard, taken down in Operation Delego), often includes technical advice regarding encryption and other measures from experienced child pornographers to assist new perpetrators from detection from law enforcement.