Boolean expressions

Boolean expressions are mathematical expressions that are either true or false. They're great for filters. Here are some Boolean expressions:

age = 30 (this is either true or false for each person in your data set)

price + tax < 10.00

3 > 4 (this is almost always false)

In contrast, regular mathematical expressions turn out to be numbers instead of true or false, so

3 + 4 is not a Boolean expression. Neither is

age + 12