https://bugs.documentfoundation.org/show_bug.cgi?id=149008

--- Comment #2 from [email protected] ---
(In reply to Rizal Muttaqin from comment #1)
> Could you please tell me the usage for "Description" (e.g. step by step to
> use the function) so I can got deeper understanding the difference.
First -- as a practical point -- your question has made me look more closely at
the UI -- and I can see that these two icons rarely appear and even more rarely
do they appear together.  So -- you must decide whether it is worth the trouble
to make the change -- or how much work to do with it.

(but see bug 101193, comment 46.  If that proposal is accepted, then it would
become an important issue)

Second, "Description" is a kind of meta-data that can be attached to objects
(i.e., Images, Frames, Formula, Shapes, etc.).  If you open the Properties
dialog for an image, frame, chart, formula (select one of these, right-click,
choose Properties, then Options tab), then you will see a textfield next to
Description, where you can write whatever you want.  This is one way to access
this field.

The other way to access "Description" is by selecting an object, and then use
the menu  (Format > Description), which opens a popup box, where you can enter
a Description.  The data entered in this popup box will also appear in the
Options tab in the Properties dialog for Image, Frame, Formula, Chart...

Third, the main thing is that the Description field is general -- applied to
anything non-textual -- whether image, chart, formula, drawing, shape, textbox,
frame....

Fourth, in principle, this description information might be exported to PDF,
HTML, XHTML documents, where it could be used by screen readers.  In other
words, a primary function of Description is for accessibility purposes (when a
person cannot see the non-text information) -- but I have also seen one person
in BZ mention that they used this field to document their layout.  

But -- for now -- let us say that the main function of Description is to add
some explanation of the appearance or content of non-textual material (i.e.,
used for Accessibility - a11y purposes).

Finally, where you can see the problem/issue most clearly:
Tools > Customize > Context Menus > Target (and choose Media)
(scroll to bottom of Assigned Commands, and you can see Description and Insert
Caption -- which is also what is proposed 2 days ago in  bug 101193, comment
46.

I hope that is enough information to go forward.

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