Question

Dependencies can be either build or run time dependencies

Answer 1

In run time dependencies the dependency cannot be resolved until the runtime. so to compile the time it must be easier to developer the runtime dependency. In sometimes it is more flexible

For example: If A has a B-dependence, A can not be constructed without B. On the other hand, runtime dependence is dynamic. If A is dependent on B for runtime, A can be built without B but can not run without B.