Q. What is a doi?
DOI stands for digital object identifier.
Think of it as the social security number for a journal article. It is stable or persistent and also unique--the doi gets you to the journal article even if the website URL changes.
The DOI usually will look something like this: 10.1098/rstb.2008.0235
You can turn any DOI into a clickable link by adding https://doi.org/ before the DOI itself.