[Zettelmarkup](00001007000000) is not the only markup language you can use to define your content.
Zettelstore is quite agnostic with respect to markup languages.
Of course, Zettelmarkup plays an important role.
However, with the exception of zettel titles, you can use any (markup) language that is supported:

* CSS
* HTML template data
* Image formats: GIF, PNG, JPEG, SVG
* Markdown
* Plain text, not further interpreted

The [metadata key](00001006020000#syntax) “`syntax`” specifies which markup language / data format should be used.
If it is not given, it defaults to `plain`.
The following syntax values are supported:



The actual values are also listed in a zettel named [Zettelstore Supported Parser](00000000000092).

If you specify something else, your content will be interpreted as plain text.