These are a group of facts that are collected so they can be analyzed. Data can come in many, many forms. They can be measurements, such as width, height or mass. Data could also be counts of something in an area over time. Data doesn’t always have to be something that comes in numbers. A data set could be a set of survey responses where people describe how they are feeling, for instance. Or it could even be a collection of images.
No matter what form they are in, data aren’t necessarily organized. They often come in a form that isn’t easy to understand. Scientists may spend years analyzing that data before they can draw any conclusions.
The term “data” is plural and refers to a group of facts. A single fact would be a “datum.”
In a sentence
Data from 21 retired athletes shows that hard-hitting sports like football won’t necessarily leave brain injuries behind.