What is the world record for men's 400 meters?

43 seconds, 18.

In a series of sports, such as track and field or swimming, the world record is created in a series of periodic world events. In order for the record to be recognized, sports activities must be carried out according to specific rules, and athletes must also be tested for drugs.

Breaking the world record is usually the success of an athlete's sports career. Many athletes are famous for their world records, although this is only their only major achievement.

Not all activities have world records, because the success of some activities depends too much on the venue of the competition, or there are no rules.

The application and identification of non-sports world records must also be reviewed and identified, and each world record contains a core evaluation data index.