Mixtures are classified into two main categories – homogeneous and heterogeneous. 

Homogeneous Mixture

• A homogeneous mixture appears uniform throughout. The individual components cannot be visually differentiated. 
• A homogeneous mixture possesses the same composition and properties throughout its mass.  
• All components in a homogeneous mixture are in a single phase. 
• Examples – Saline solution (salt dissolved in water), Vinegar (acetic acid dissolved in water) and Tincture of iodine (iodine crystals dissolved in alcohol). 

Heterogeneous Mixture 

• A heterogeneous mixture does not appear uniform throughout. Its individual components can be visually differentiated. 
• A heterogeneous mixture does not possess the same composition and properties throughout its mass. 
• The components in a heterogeneous mixture may be in the same or different phases. 
• Examples – Oil & Water, Salt & Pepper, Sugar & Sand, Mud (dirt and water)