schwimmen
to swim
To move through water by moving your arms and legs.
Im Sommer gehe ich gerne im See schwimmen.
In summer, I like to go swimming in the lake.

to swim
Loading your saved state.
to swim
To move through water by moving your arms and legs.
Im Sommer gehe ich gerne im See schwimmen.
In summer, I like to go swimming in the lake.

The perfect tense of 'schwimmen' (to swim) is formed with 'haben' when the activity itself is meant. It is formed with 'sein' when movement from one place to another is being described.
Ich habe heute eine Stunde im Pool geschwommen.
I swam in the pool for an hour today.
Whether 'schwimmen' means 'to move through water' or 'to float' depends on the subject. People and animals swim actively. Inanimate things like wood or oil float passively on the surface.
Mein Hund schwimmt sehr gerne im Fluss.
My dog really likes swimming in the river.
Common combinations are 'schwimmen gehen' (to go swimming) as well as places with the preposition 'in', for example 'im Meer schwimmen' (to swim in the sea), 'im See schwimmen' (to swim in the lake), or 'im Schwimmbad schwimmen' (to swim in the swimming pool).
Wollen wir am Nachmittag schwimmen gehen?
Shall we go swimming in the afternoon?
The expression 'ins Schwimmen kommen' or 'ins Schwimmen geraten' means that someone becomes unsure and loses control, especially when answering questions.
Bei der unerwarteten Frage des Chefs geriet er sichtlich ins Schwimmen.
At the boss's unexpected question, he visibly started to flounder.
The figurative meaning 'to be unsure' is used mainly in colloquial language, often in the context of exams or interviews.
In der mündlichen Prüfung habe ich bei der letzten Frage ganz schön geschwommen.
In the oral exam, I really floundered on the last question.
The colloquial expression 'im Geld schwimmen' (to be rolling in money) is a fixed expression. It means that someone is extremely rich.
Nach dem Verkauf seiner Firma schwimmt er im Geld.
After selling his company, he is rolling in money.
to bathe / swim
'baden' and 'schwimmen' both have to do with water. 'schwimmen' means that you move through water using your arms and legs. 'baden' can mean that you are in the water for pleasure, for example in a lake or swimming pool. But it can also mean that you wash yourself in a bathtub. Learners often confuse the words because when you 'baden', you sometimes also swim. If the movement in the water is important, you say 'schwimmen'. If being in the water or washing in the bathtub is important, 'baden' fits better.

Im Sommer schwimmt Max jeden Morgen zehn Bahnen im Freibad.
In summer, Max swims ten laps every morning at the outdoor pool.
Am Abend badet Lisa, weil sie sich nach dem langen Tag entspannen möchte.
In the evening, Lisa takes a bath because she wants to relax after the long day.