Extension is…
The property of taking up space.
In computer science and programming, extension refers to a file format or suffix that is appended to the end of a filename to indicate the type of file it is. An extension typically consists of a dot “.” followed by a few characters, such as .txt, .docx, .png or .pdf.
Extensions help computers identify and use the correct software to handle different types of files. For example, a .txt file extension indicates it contains plain text, while a .png file extension means it contains an image in the Portable Network Graphics format.
Extensions also allow users to easily search for files with specific types of contents or view files with the appropriate programs. Additionally, some extensions may have security implications, such as executable files (.exe) that may contain viruses or malware.
In summary, an extension is a suffix added to the end of a filename to indicate the type of file, and it plays an important role in helping computers identify, categorize, and use different types of files appropriately.
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