NoFap is a group that promotes the benefits of abstaining from masturbation as part of a process to break pornography addiction. They offer challenges to their participants (who are called fapstronauts) to abstain for set periods of time and have a large community on their own website and on Reddit, which offers support through the process.
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NoFap asks participants to read a list of rules before taking on any of their challenges. These rules elaborate on the "no masturbation" premise and include things like "no edging" and "no porn." Participants are able to select the level of difficulty and length of their challenge.
NoFAp states that it is not anti-masturbation, and that its program centers around abstaining for a period of time.