What is a run time environment?

Solution
A run time environment is an environment that has everything you need to execute a program, but no tools to change it. A dos box, JRE, CLR, virtual box. and few others. There is also the build environment which developers use to code programs.

Here is a link for a fuller understanding of a RTE
https://techterms.com/definition/rte
So do all programs have their own run time enviorments? Like Chrome and CS:GO?

 
So each program has their own RTE or can multiple programs utilize a single one? What RTEs do videos game run in?

 


For instance, the Java Runtime Environment (JRE)
http://www.oracle.com/technetwork/java/javase/downloads/jre8-downloads-2133155.html

Multiple applications written in Java can use that on your system.