File Extension/file format

English (en)

File Extension/file format 
A file extension, or filename 
extension, is a suffix added 
to the name of a file when it 
is saved to indicate the file's 
format, detailing how the data 
within the file is organised. 
A file's data must be properly 
organised according to its format 
to ensure it can be accessed by the 
software programme associated with 
that specific file type.