Saltwater is water that contains a high concentration of salt, primarily sodium chloride. It is most commonly found in the world's oceans and seas, making up about 97% of all the water on Earth. This salty water is essential for marine life, providing a habitat for countless species, from tiny plankton to massive whales. In addition to supporting ecosystems, saltwater is also important for human activities. It is used in industries such as fishing and tourism, and it plays a role in regulating the Earth's climate. However, saltwater can be challenging for drinking and agriculture, leading to the need for desalination processes to make it safe for consumption.