Here's why:

* Polarity: Water molecules are polar, meaning they have a slightly positive end (hydrogen atoms) and a slightly negative end (oxygen atom). This allows water to form hydrogen bonds with other polar molecules, like sugars and proteins.

* Hydrogen Bonding: The ability of water to form hydrogen bonds is crucial for its solvent properties. These bonds allow water to dissolve a wide variety of substances, including salts, sugars, and some proteins.

* High Dielectric Constant: Water has a high dielectric constant, which means it can reduce the attractive forces between ions, making it easier for them to dissolve.

Important Note: While water is often called the "universal solvent," it doesn't dissolve everything. Non-polar molecules (like fats and oils) are generally not soluble in water.