GENEVA EDUCATION
There are two major types of calculus, known as Infinitesimal Calculus and that part of the total which is called Differential Calculus. Both types are built on a foundation on analytic geometry and are related by the Fundamental Theorem of Calculus. In simple terms, the theorem states that the sum of infinitesimal changes over time or some other quantity will add up to the net change.
To use a living plant as an example, as it grows, you can see the difference in size, or the increase over a period of several days and you could measure the growth, using conventional means. However, if you were to measure the difference in size after only ten seconds, it would be much more difficult to determine. If you then were to attempt to determine not the amount of growth over the time period, but the rate of growth over those seconds, you would not be able to do that using algebraic terms.