This clip comes from a user uploaded soundboard recording where the creator simply recorded themselves saying yes for others to reuse. With no known film, show or celebrity source behind it, its popularity online comes entirely from how versatile a single plain affirmation can be. Short affirmative sounds like this circulate on soundboards and in chat apps because they can replace typing a reply, punctuate a joke or act as a sound effect for agreement. Its low view count and homemade quality are part of its charm as a generic reaction.