A logical expression is a statement that can be evaluated as either true or false. These expressions often use logical operators such as AND, OR, and NOT to combine or modify conditions. For example, in programming, a logical expression might check if a number is greater than 10 AND less than 20, resulting in a true or false outcome. Logical expressions are fundamental in computer science and mathematics, as they help in decision-making processes. They are used in algorithms, Boolean algebra, and conditional statements to control the flow of programs. Understanding logical expressions is essential for effective problem-solving and programming.