Laravel public functions - Why are there @ symbols in comments before a function?

Hi everyone,

I'm new to Laravel, and I saw this video from Laracasts where I learned about policies.

I saw this bit of code:

/**
* Some comment
*
* @param \App\User $user
* @param \App\Conversation $conversation
* @return mixed
*/
public function update(User $user, Conversation $conversation)
{
    //
}

And I'm curious: do the words after the @-symbols (param, return and a few others I saw) a use case? Or are they just for more readable code?

And do they have a specific name? I searched on Google but couldn't found one.

Thank you! Jeroen