Usually just another word for Static site generation (SSG).

Sometimes, Prerendering and SSG are differentiated as follows:

• SSG happens at build time. Prerendering can be done by the Server-side-rendering server, once it detects assets that might benefit from being statically served
• Prerendering single routes (for example, the root-route) in a Client-side-rendering app. A common React library does this.