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A cylinder can be considered a cone whose apex has moved to infinity.
It goes to "the point at infinity"
Firstly, infinity is not a number (at least in lower level mathematics). You must instead use the language of limits to describe infinity. Using limits, a function which diverges to infinity multiplied by a function which diverges to infinity has a product which also diverges to infinity. However, taking this product, and subtracting away a function which diverges to infinity is "of indeterminate form". It might converge to zero, it might be diverge to positive infinity, it might diverge to negative infinity, or it might converge to a constant. In order to figure out which one of these possibilities applies, you must get the indeterminate form into the form infinity divided by infinity or 0/0 and then apply L'Hospital's rule. Edit: Just a pet peeve of mine. It's L'Hôpital, not L'Hospital. Even textbooks don't spell it right.
Infinity is not a number; it is a concept. There is no highest number, because you can always add 1 to it and create a higher number. If this new number is the highest number, then add 1 again and it isn't. The process can never end, so infinity is used to describe the idea: a process that never ends.
1 one infinity divided by infinity