Why talk about water? This vital compound is not equal to anything that gives life to humans, animals and plants; in short, to the entire ecosystem on Earth. How vital can it be to have water to drink to quench your thirst, to accompany our food and to make our environment livable? Many of us ignore the importance of this, either by squandering this common good, or by using it to do business. I will talk about how water is used in various continents and also how it is exploited by some for business, when a common good should belong to all and at low cost. Then we will also address the most important topic, pollution, which today destroys entire seas, lakes and rivers. Sources polluted by the neglect of man towards the environment and towards himself, yes, because those who ruin their territory will also ruin their own future and this is incomprehensible by all those who are defending this planet of ours. We will talk about the various types of water and their characteristics and their qualities. In short, a complete roundup that will bring more knowledge for this immense good that is water.