Alkaline substances are materials that have a pH level greater than 7, indicating they are basic rather than acidic. Common examples include substances like sodium bicarbonate (baking soda) and ammonia. These substances can neutralize acids and are often used in cleaning products, agriculture, and food preparation. In chemistry, alkaline substances are typically associated with the presence of alkali metals such as sodium and potassium. They can react with acids to form salts and water, a process known as neutralization. Alkaline solutions can also affect the taste and properties of food and beverages, making them an important aspect of cooking and food science.