Steam is a digital distribution platform for PC gaming that offers game developers access to a vast global audience, revenue opportunities through various pricing models, integration with Steamworks for feature-rich gameplay experiences, community engagement tools, early access and beta testing options, promotional opportunities, protection against piracy, analytics and data insights, and a revenue-sharing model. It's a comprehensive ecosystem that can significantly enhance a game's reach and success.
Publishing a game made with Hology is like publishing any HTML5 game to Steam. You first need to package it into an executable application that can be installed on a PC. A popular choice for this is Electron.js. Please refer to the Electron.js docs for how to package your application.