Bubbles in soda are formed by carbon dioxide gas, which is dissolved in the liquid under pressure. When the bottle or can is opened, the pressure is released, allowing the gas to escape and form bubbles. This process creates the fizzy sensation that many people enjoy when drinking carbonated beverages. The presence of bubbles not only adds to the texture and taste of the soda but also enhances its aroma. Common types of soda include cola, lemon-lime, and root beer, each offering a unique flavor profile that is complemented by the effervescence of the bubbles.