Infinity () is a mathematical concept which is about things that never end. It is written in a single digit. Infinity means many different things, depending on when it is used. The word is from Latin origin, meaning "without end". Infinity goes on forever, so sometimes space, numbers, and other things are said to be 'infinite', because they never come to a stop. Space and others can have infinite volume, but sometimes, things like toruses can be confused with infinite volume because they never stop.[1]
Infinity is usually not an actual number, but it is sometimes used as one. Infinity often says how many there is of something, instead of how big something is. For example, there are infinitely many whole numbers (called integers), but there are some integers which are infinitely big, like aleph null, because the cardinality of the list of natural numbers has to be an integer, because you cannot have 2.718281828... items on your shopping list, can you? That would be quite confusing! But different kinds of math have different kinds of infinity. So its meaning often changes.
There are two kinds of infinity: potential infinity and actual infinity. Potential infinity is a process that never stops. For example, adding 10 to a number. No matter how many times 10 is added, 10 more can still be added. Actual infinity, on the other hand, refers to objects that are accepted as infinite entities (such as transfinite numbers).[2]