Res.Render documentation missing information.

I cannot find any information anywhere in the documentation or of other sources where res.render pulls the HTML from that we are referencing in the documentation.

For example, I want to render some HTML (preferably in a file somewhere) and inject some variables into it. In the photo below at docs we are stating 'email'.

• Does this mean email.html in the same directory as this .js script?
• Does this mean we previously read the file email.html and read it into memory somewhere?

I have been trying to understand this process of express and utilize this function but everyone just glances over this part in particular.

So. where is the html for email?