What is “snowball effect”?

Snowball effect is a growing process. Snowball effect is a growing process that starts from an initial state of small significance and builds upon itself, becoming larger and perhaps potentially dangerous or disastrous. It is like a rolling snowball , as it rolls, the ball pick up more snow, gain more mass and pick up even more snow as it rolls along. The term of Snowball Effect is mostly used for very small and insignificant things to grow up exponentially and become very significant .It can also be used to describe things which show a rapid growth.