A continuous variable is a way of organizing distributions which can have any range of values in between differing values. An example of a continuous variable is weight or height - a person doesn't have to be either 150 pounds or 151 pounds. They could be 150.6 or 150.99999 pounds. This is opposed to a discrete variable which uses a distinct label instead of a continuous one. For example, eye color or gender can be considered a discrete variable because individuals are either part of a category or they aren't - there is no range of answers in between.