A studio, small team or indirivudal who that specializes in video game development.
Publishing (Self Publishing & Publishers)
Develping a game is one only half of the equation. Once a game is developed it then needs to promoted, manfucatored, licensed on platforms, distributed and finally sold. Developers and studios have one of two choices, they can either do this themselves, or hire a spcialied publishing company to do it for them. Often before a game is even developed a studio will pitch an idea to a publisher, who might then fund the project, and own the IP at the end of the process. It is also no uncommon for large publishers to own a number of studios. An example of this would be Ubisoft, or Sony World Wide Studios.
PR [Public Relations] (Internal & External)
Sometimes a studio, developer or publisher will hire the services of a PR agency to handle the communication element of the publishing. It is also not uncomon for larger publishers like Ubisoft to have internal PR deparments and not outsource this work. When it comes to requesting games typically it’s the PR representative (either internal or exertnal) that you want to speak to.