File extension.
The extension.
file extension
XLS is the shorthand for Microsoft Excel file extension. A file extension is the group of letters following a period in a file name, denoting what kind of file it is.
File extension.
period
The following symbols can not be used in a windows file name:\*:?/>
Following characters are not allowed in the file name (Separated by comma). /, \, ?, %, *, :, |, ", < and >
The kernel image is the file in /boot that has a name like "vmlinuz" in it.
The second part of a file name is typically referred to as the file extension, which follows the last period in the name. It identifies the file type and helps the operating system determine which application should open it. For example, in the file name "document.txt," "txt" is the file extension indicating it's a text file.
The extension. It tells Windows what kind of a file it is. For example, a file with the ".doc" extension is a Microsoft Word Document.
its an extension for the file name which tells about the file type. but I just have a query, why most of the extensions are three lettered
Just change the extension (Rename).There is no difference between jpg and jpeg as file types ot kind of information they contain.