Why do they call it "mineral water"?

Mineral water is not the same as the water that comes out of your faucet. It's supposedly harvested from a natural source, ie a spring or well, where it has spent a long time trickling through the earth and absorbing minerals, hence the name.

It does contains minerals which are necessary to our health. Some mineral water come from the nature. If it clear and good enough, it will can be sold in bottle after simple processing. Some of mineral water are manmade from plain water. But i will prefer plain water because I believe I can get mineral enough from daily foods.

yes, water contains mineral in it.but it may not contain some minerals which we need. so artificially some minerals added to the water and packaged it and come to the market.

Natural water contains essential minerals and salts which are important for the body. Purification destroys these minerals. Mineral water claims to purify water as well as preserve these minerals so that our body makes up faster when exhausted.