* Acids and bases are defined relative to each other. They are defined based on their ability to donate or accept protons (H+ ions).

* Neutral substances have a pH of 7. This means they are neither acidic (pH below 7) nor basic (pH above 7).

* Examples of neutral substances: Pure water (H2O), table salt (NaCl), and many organic compounds like sugar.

Important Note: The concept of acidity and basicity is context-dependent. A substance can be acidic in one context and basic in another. For example, water is neutral at room temperature but can act as an acid or a base in different chemical reactions.