What is a runtime?

In programming, a problem have different phases in its overall lifecycle. Depending on the specific programming language, the program may require compiling. The phase when a program is compiling is called the compile time. Similarly, when a programming is executing or running this phase is called the execution time or runtime.

During a program’s runtime there may be errors. These are called runtime errors. Examples of runtime errors are dividing my zero, attempting to read a file on a file system that does not exist, and making a request to a website which does not exist.