Swimming in a pool is different from swimming in the sea because pools have clear water and no waves. Pools are also usually warm, so they're comfortable to swim in all year. The sea, on the other hand, has waves and tides, and you can see fish and other sea animals.

Pools are safer because they have lifeguards and marked depths. They're easy to find in cities and have changing rooms. But when you swim in the sea, you have to be careful of currents and things like jellyfish. The sea is more adventurous and connects you to nature.

Swimming in a pool is usually for exercise or training, and they can get crowded. But swimming in the sea is a special experience with the sound of waves and open space. It feels more free and relaxing.

Pool water has chemicals like chlorine, which can be bad for your skin and hair. Sea water has minerals that are good for the skin. Swimming in the sea also gives a full-body workout because of the waves, and saltwater feels refreshing.