Infinity
Infinity is idea of something that has no end, more specifically concepts describing something without any bound. The concept of infinity used everywhere like in Mathematics, physics and other sciences too. In simple words we can say Infinity is something larger than any natural number. The mathematical symbol $∞$ used to represent the concept of infinity.
Is infinity is real number?
No. Infinity is not real number. If we assume $x\in \mathbb{R}$ is infinity i.e. $x=∞$ then $x+1>x$ is number greater than infinity and Hence $x≠∞$.