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, the expression "A AND B" is true only if both A and B are true. Logical expressions are commonly used in computer programming, mathematics, and decision-making processes. They help in making decisions based on certain criteria. For instance, in a programming context, a logical expression can determine whether a user is eligible for a service based on their age and membership status.