A random variable is: A value that is uncertain or unpredictable.
An example of a discrete random variable is : The number of floods per year in New York City
A random variable is a variable whose value is subject to chance. It can take on one of many possible values, each with a certain probability. Random variables are used to model a wide variety of phenomena, such as the weather and the stock market.
A discrete random variable is a random variable whose set of possible values is finite or countably infinite. Discrete random variables are often represented as sequences of numbers, with each number representing the probability of the corresponding outcome occurring.