A world record is the best performance ever in a certain discipline. Generally speaking, world records are linked to sports, but there are every time odder world records contained in the Guinness World Records.

In sports, world records must be realized in certain conditions to be recognized officially. A world record can be performed on a point basis, or in terms of time or distance. According to experts in medicine, world records will get harder and harder to break in so far as they esteem that the human top potential is already reached.

Swimming is one of the sports where world records are the most frequently broken. As a matter of fact, during the last Olympics, 25 world records were broken. 14 records were broken by men (four by the American Michael Phelps) and 11 by women. In athletics, another athlete made a great impression after breaking three world records. This athlete is Usain Bolt who realized the best performances ever for 100m, 200m, and relay 4x100m.