So this infinity word is used for unending words. There are only the 2 and only 2 sizes of infinity, proved by George Cantor. Infinity can never be larger or smaller than 2 times infinity, because infinity is not a number. Is 2 times infinity bigger than infinity? Natural numbers are said to have this kind of infinity, if all the sets can put into a bijective relation. This kind of infinity is known as countable infinity, according to definition. The infinite set contains a set of natural numbers. To talk about and to compare amounts that are unending, you need infinite numbers, but some of unending amounts are literally bigger than others. It is considered as last number and there is no largest number, instead infinity. Infinity is not a number, but it is a kind of number. Well-ordered sets, or counting carried on to any stopping point including points after an infinite number have already been counted, are characterized in ordinal numbers.
It is just an concept to calculate values and to solve numerical problems.
Infinity is used for the things which we are not able to count because of the unlimited strength or number of the thing. Actually, infinity is a value which is used to shown unlimited numbers or value which are not countable. Infinity does not mean any number which is written like other number values like 1-6-9 etc.