Carrying capacity refers to the highest number of organisms that an environment can support. The carrying capacity of environment is often compared to the carrying capacity of the roads. There is always a limit to the number of organisms that an environment can support. This is very much similar to the limit of cars a road can support. If the number of organisms in an environment keeps on increasing, then the limited resources will no longer be available to support the life. Hence, life will reach its stagnation point. Similarly, if the number of vehicles on road exceeds the number it can handle, there will be traffic jams. In both the cases, growth/movement will take place but at a very slow rate.