A digital object identifier (DOI) is a persistent identifier used in scholarly publishing to identify and link to a piece of work. DOIs are considered by numerous journals to be mandatory for citation and can be assigned to datasets, preprints, research articles, websites, and other scholarly works.
Here is an example of an Authorea preprint that has a DOI assigned
\cite{Minkov}. With Authorea one can assign a DOI to a document in
just one click. But wait there's more. Authorea is now integrated with the top journal publishers so that authors can submit directly their preprints to their journal of choice, again, in one click.