What it is: It consists in adding to the wine a fining agent that by means of electrostatic charge joins the particles in suspension with opposite charge, forming larger floccules that precipitate due to gravity.
What its purpose is: Its purpose is to eliminate sediments or particles in suspension. For example, egg white has an opposite charge to the tannins, therefore these two substances join and precipitate; it is added to red wines in order to eliminate the excess of tannins in suspension.