A
world record is usually the best global performance ever recorded and officially verified in a specific
skill or
sport. The book
Guinness World Records collates and publishes notable records of all types, from first and best to worst human achievements, to extremes in the natural world and beyond. The website
RecordSetter has begun to take on the same territory, but with a more inclusive policy, as users submit videos of record attempts in order to try to receive a world record. The website
challengers.guinnessworldrecords.com is similar to
RecordSetter, as the record attempts are judged by Guinness World Records adjudicators, but the records to attempt are provided beforehand.