Human swimming is the self-propulsion of a person through water or other liquid, for survival, recreation, sport, exercise or other reason. Locomotion is achieved through coordinated movement of the limbs, the body, or both. Humans are able to hold their breath underwater and undertake rudimentary locomotive swimming within weeks of birth, as an evolutionary response.
Swimming is consistently found to be among the top recreational activities undertaken by the public and in some countries; swimming lessons are a compulsory part of the educational curriculum. Similar to that, swimming is very much important for a cabin crew. International flights move around the world and the flight may sometimes have to emergency land in water, in such case a cabin crew member must safely take out the passengers from the plane to some safe destination and for that they must know to swim. Hence, any cabin crew should at least know to swim a length of 25-30 meters, put on a lifejacket whilst in the pool and inflate it manually, enter the pool with an inflated lifejacket (either jump in or sit in), climb into a life raft (maybe set up the roof too – airline dependent) and “Lifesaver” someone.
Ditching is actually landing in the water. The phrase “water landing” is also used as a euphemism for crash-landing into water in an aircraft not designed for the purpose.