Lemon juice is a sour liquid extracted from fresh lemons, a citrus fruit known for its bright yellow color and tangy flavor. It is commonly used in cooking and baking, adding acidity to dishes and enhancing flavors. Additionally, lemon juice is a popular ingredient in beverages, such as lemonade and cocktails. Rich in vitamin C, lemon juice offers various health benefits, including supporting the immune system and aiding digestion. It can also be used as a natural preservative due to its acidity, which helps inhibit the growth of bacteria. Overall, lemon juice is a versatile and nutritious addition to many recipes.