The term "less than" is a mathematical comparison used to indicate that one quantity is smaller than another. It is often represented by the symbol "<". For example, in the expression 3 < 5, it shows that the number 3 is less than the number 5. This concept is fundamental in mathematics and is used in various fields, including science and finance. In everyday language, "less than" can describe quantities, sizes, or amounts. For instance, if you have 5 apples and your friend has 3 apples, you can say your friend has "less than" 5 apples. This comparison helps in understanding differences and making decisions based on quantities.