Has more salinity than fresh water, but not as much as seawater (semi-salty). It may result from mixing of seawater with fresh water.
Permanent ice is the largest freshwater storage on Earth, accounting for about 2% of the total global supply - or nearly 69% of the total freshwater supply. Freshwater is also found beneath the Earth's surface as groundwater (30% of the total freshwater supply) and in surface water storage such as lakes, streams, swamps and, marshes.
Saltwater is water with salt in it. Most it often means the water from the seas and oceans.
Brackish Water and Fresh Water
Fresh Water has less salt than Brackish water. Brackish water is not completely drinkable but Fresh water is drinkable. Also Brackish water is the mixture of Saltwater and Fresh water.
Brackish Water and Saltwater
Saltwater has more salt than Brackish water. Also Brackish water has both Fresh water and Saltwater making the water more diluted and less concentrated with salt.
Fresh Water and Saltwater
Fresh water and Saltwater are completely different from each other. Saltwater is not drinkable and fresh water is drinkable. They both can not sustain the same aquatic creatures.