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A discrete variable can only have values at specific values. See: Logical Data Modeling - Domain (Permitted value set)
A time can also be discrete. wiki/Discrete_time_and_continuous_time
Illustration Continuous vs Discrete: A Geneva drive is a gear mechanism that translates a continuous rotation into a discrete motion.
Discrete and
Type of Variable
- numerical variables can be discrete. For instance, an integer is a discrete data type. The number of person on the planet must be a whole number.
- All categorical variables are discrete.
Continuous
Any-time you measure a variable that can only be measured in discrete values, you are using a variable that is not truly continuous.