I'm a student of Zoology having class XII Maths background.
I stumbled upon asymptote while studying S-shaped growth form in ecology. I tried to google it up and found wikipedia define it in the following way:
In analytic geometry, an asymptote of a curve is a line such that the distance between the curve and the line approaches zero as they tend to infinity.
I don't get the last part. What does it mean?
NOTE: K (carrying capacity) is the asymptote in the diagram.