"Acidic" refers to a property of substances that have a pH level less than 7. These substances can donate protons (H⁺ ions) in a solution, making the environment more acidic. Common examples of acidic substances include lemon juice, vinegar, and battery acid. Acids can react with bases in a neutralization reaction, producing water and a salt. They are important in various fields, including chemistry, biology, and industrial processes. Understanding acidity is crucial for applications like food preservation, digestion, and environmental science.