Ruby is a server-side scripting language that can be used with the development framework Rails to create web and mobile applications with MySQL, MongoDB, Redis, MariaDB, PostgreSQL, etc. database support. Almost all of the major web hosting companies now support Ruby and RoR on their LAMP stack in shared web server environments by default. Most of the professional development for Ruby/RoR takes place on VPS & dedicated server plans, which can be scaled in production with containers and elastic clusters.
Ruby on Rails is a small development community compared to other programming languages although there are still a large number of resources available online for learning and using the code for web/mobile applications. There are not many open source Ruby/RoR scripts that are common in web development where most examples tend to be custom coded applications where the solution outperforms PHP and other programming languages in performing the same tasks.