hugo/docs/content/en/functions/global/site.md

title	description	categories	keywords	action	aliases
site	Provides global access to the current Site object.			aliases related returnType signatures functions/global/page site	/functions/site

At the top level of a template that receives the Site object in context, these are equivalent:

{{ .Site.Params.foo }}
{{ site.Params.foo }}

When the Site object is not in context, use the global site function:

{{ site.Params.foo }}

{{% note %}} To simplify your templates, use the global site function regardless of whether the Site object is in context. {{% /note %}}