Natation vs. nage

Both 'natation' and 'nage' refer to the act of swimming, but they are used in different contexts within the French language. Understanding their different uses is essential for proper usage.

Natation

'Natation' refers to the sport or activity of swimming, often considered in a formal or competitive context.
Il prend des cours de natation tous les samedis.
(He takes swimming lessons every Saturday.)
La natation est une excellente forme d'exercice physique.
(Swimming is an excellent form of physical exercise.)
Aux Jeux olympiques, la natation est une épreuve très populaire.
(At the Olympic Games, swimming is a very popular event.)

Nage

'Nage' denotes the action of swimming and can refer to the style of swimming or simply the act of moving through water. This term is often used more informally or casually than 'natation'.
Il préfère la nage papillon à la nage libre.
(He prefers butterfly stroke to freestyle swimming.)
Après une heure de nage, ils sont sortis de l'eau fatigués mais heureux.
(After an hour of swimming, they got out of the water tired but happy.)
La nage synchronisée est une discipline qui requiert beaucoup de coordination.
(Synchronized swimming is a discipline that requires a lot of coordination.)

Summary

In summary, 'natation' generally refers to the sport or discipline of swimming, and is often used in contexts such as instruction or competition. On the other hand, 'nage' refers more to the actual act or manner of swimming and can be used in various informal situations as well as to refer to specific styles of swimming.