How brand Ambassador work?

How company give the money to celebrity or to creator like YouTuber, podcaster and many more, how the advertisements are created ( Instagram:- @themrinalsinghshow_podcast @mrinalsingh6034 Twitter:-@themrinalsingh_ LinkedIn:-@Mrinal Gajendra Singh Blogger:- themrinalsinghshow.blogspot.com Wordpress :- themrinalsinghshow416872400.wordpress.com )