Data refers to information or facts that are collected, stored, and used for analysis [careful study and examination] or reference [looking at it for information]. It can be in various forms, such as numbers, words, images, or videos.
For example, when you record the grades of students in a class, the grades are considered data. Similarly, when you take a picture with your phone, the image captured is also a form of data.
Very Simple Definition:
Data is information that we collect, store, and use later. It can be numbers, words, pictures, or videos.
For example, if we write down the names of our friends in a list, that list is data. Or if we take a picture with our camera, that picture is also data.