Name of file and its suffix [closed]

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Is suffix ( for example .jpg or ,txt ) a part of file name ?

for example I have this file : "picture.jpg", what is file name in this file ? thanks

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Yes,these suffixes are the part of the file name,as they are the formats

in which the files are saved on to your computer,From here

Filename extensions can be considered a type of metadata. They are commonly used to imply information about the way data might be stored in the file. The exact definition, giving the criteria for deciding what part of the file name is its extension, belongs to the rules of the specific filesystem used; usually the extension is the substring which follows the last occurrence, if any, of the dot character (example: txt is the extension of the filename readme.txt, and html the extension of mysite.index.html).

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Read about it here: http://en.wikipedia.org/wiki/Filename_extension

A filename extension is a suffix to the name of a computer file applied to indicate the encoding convention (file format) of its contents.