What Is a File

A File Stores Information

A file is a collection of information saved on a computer. Every piece of work you create — a drawing, a story, a photo — gets saved as a file. Files stay on the computer even after you switch it off.

Example

Think of a file like a page in your exercise book. The page holds your written work. A computer file holds digital work — words, pictures, or music — instead of ink on paper.

Every File Has a Name

Each file gets a filename so you can find it later. A filename has two parts separated by a dot. The part before the dot is the name you choose. The part after the dot is called the extension — it tells the computer what type of file it is.

Common File Types

Different types of files use different extensions. The extension tells the computer which program to use to open the file.

How Big Is a File?

Files take up space on the computer's storage. We measure this space in units. A small text file is just a few kilobytes (KB). A photo is a few megabytes (MB). A long video is several gigabytes (GB).

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