â„šī¸ What is a File Extension?

A file extension is a group of letters that appear after a filename and a dot (e.g., report.pdf or music.mp3). It tells your operating system what type of file it is and which program should open it.

For example, files ending in .docx are usually Microsoft Word documents, while .jpg files are images. Knowing the file extension helps users open files correctly and avoid unknown or potentially dangerous formats.

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