Infinity is a concept that describes something without any limit or end. In mathematics, it is often represented by the symbol ∞ and is used to express the idea of an unbounded quantity. For example, the set of natural numbers 1, 2, 3, ... goes on forever, illustrating the concept of infinity. In addition to mathematics, infinity appears in various fields such as philosophy and physics. It raises intriguing questions about the nature of the universe and existence itself. The idea of infinite space or time challenges our understanding of reality and encourages deeper exploration of the cosmos.