👉 The term "countable" refers to something that can be counted or measured, such as a number, quantity, or size. It is often used in scientific and mathematical contexts, where it describes a set of numbers that are either finite or infinite. For example, the set of all natural numbers (1, 2, 3, ...), or the set of all integers (..., -3, -2, -1, 0, 1, 2, 3...