The Poissonprocess is a continuous-time process: its discrete-time counterpart is the Bernoulli process.
A Poissonprocess is a pure-birth process, the simplest example of a birth-death process.
Just as a Poissonrandom variable is characterized by its scalar parameter λ, a homogeneous Poissonprocess is characterized by its rate parameter λ, which is the expected number of "events" or "arrivals" that occur per unit time.