File Extension

A file extension is a set of characters at the end of a file name, following a dot (e.g., .docx, .jpg). It indicates the type of file and helps your computer recognize which program should open it. For example, a .pdf file is typically opened with a PDF reader, while a .mp3 file plays with a media player. The extension acts like a label that guides the software on how to handle the file, making it easier to organize and access your documents, images, videos, and other data efficiently.