Exponential Decay. hope this will help :)

Exponential growth is when the amount of something is increasing, and exponential decay is when the amount of something is decreasing.

They are incredibly different acceleration patterns. Exponential growth is unbounded, whereas exponential decay is bounded so as to form a "dynamic equilibrium." This is why exponential decay is so typical of natural processes. To see work I have done in explaining exponential decay, go to the page included in the related links.

Exponential growth has a growth/decay factor (or percentage decimal) greater than 1. Decay has a decay factor less than 1.

Exponential growth goes infinitely up. Exponential decay goes infinitely over always getting closer to the x axis but never reaching it.

ADDED: An exponential decay trace's flat-looking region has its own special name: an "asymptote".