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NickyBones447922dRandom process is a series of random variables. For each fixed moment in time, you can describe the process as a variable. But you may have a different random variable in every point in time.
Stationary process means the statistical properties. (e.g. mean) are not time dependent. Ergodic processes are those you can deduce their statistical properties from a large enough random sampling.
Demolishun844522dBut, things only appear random. Everything is a sequence of events and interactions. What appears to be random is a lack of understanding of the events that influenced the outcome.