Infinity is a concept that describes something without any limit or end. It is often represented by the symbol ∞. In mathematics, infinity can be used to describe quantities that grow indefinitely, such as the number of points on a line or the size of certain sets. In everyday life, infinity can be seen in ideas like time or space, which are often thought to go on forever. For example, the universe is considered infinite because it has no known boundaries. Understanding infinity helps in various fields, including mathematics, philosophy, and physics.