**Probability:**

Probability means possibility. It is **a branch of mathematics that deals with the occurrence of a random event**. Probability theory is a branch of mathematics focusing on the analysis of random phenomena. It is an important skill for data scientists using data affected by chance. With randomness existing everywhere, the use of probability theory allows for the analysis of chance events.

**Random Experiment:**

A random experiment is **any well-defined procedure that produces an observable outcome that could not be perfectly predicted in advance**. A random experiment must be well defined to eliminate any vagueness or surprise.

**Outcome:**

Outcome is **the result of a single trial**. So, if it rains today, the outcome of today’s trial from the experiment is “It rained” Event is one or more outcome from an experiment. “It rained” is one of the possible event for this experiment.