Is hugo a website builder?

What does Hugo basically do?
Do they provide a template?

Hugo Documentation | Hugo – see the first sentence to answer your first question.

Yes I know but I want to know can we integrate it with our website

Impossible to say unless you provide detail. Like what “integration” means for you.

As they use to say in edgier forums… RTFM. Out with spammers.
Gosh I’m sick of those types who won’t read the homepage of a project. At least trolls are funny, usually.