Outcome: A single possible result from a random process.

Tossing 2 coins could result in 4 possible outcomes: HH, HT, TH, TT.

Event: A set of outcomes.

When tossing 2 coins, getting exactly one head is an event. There are two possible outcomes yielding this event: HT, and TH.

Sample Space: The set of all possible outcomes.

For a 2 coin toss s = { HH, HT, TH, TT }

Disjointed Events: Events that can't happen simultaneously. If 2 coins are tossed, they cannot be both HH and TT at the same time.