Independent events with a constant probability of occurrence over a fixed interval of time (or space).
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The Poisson distribution is discrete.
Poisson and Binomial both the distribution are used for defining discrete events.You can tell that Poisson distribution is a subset of Binomial distribution. Binomial is the most preliminary distribution to encounter probability and statistical problems. On the other hand when any event occurs with a fixed time interval and having a fixed average rate then it is Poisson distribution.
It can be.
symmetrical
A skewed bell shape.