The particles in a solution are atoms, ions, or molecules. The particles are obviously too small to be seen and will not separate out on standing. Solutions have two parts. Water is a solvent which can dissolve 1,000s of substances. Water is often called the universal solvent because it dissolves so many materials.
Water is a polar molecule.
The oxygen end has a slightly negative charge and the hydrogen end has a slightly positive charge. The positive end of a water molecule is attracted to the negative end of another water molecule. Other molecules which are polar are attracted to the ends of water molecules. Two properties of water are explained by its polar nature. Cohesion is the property of water where water sticks to water.