file name extension

A suffix that is preceded by a decimal (".") and that is appended to a computer file name. Note: Common filename extensions with their meanings are:

.wpd = a type of word-processing document

.doc = a type of word-processing document

.exe = executable code or a self-extracting archive file.

.gif = a graphical interchange format (graphics file)

.txt = a text file.

2. Proprietary HTML tags that are recognized by a single Web browser or by those Web browsers developed by a single company.