What is the difference between Compile time Exception and Runtime Exception?

Compile time is where your compiler transforms your source code to a machine understandable language.

During the compile time, it processes through various stages:
Creation of Symbol table, Syntax analysis, Semantic analysis, Code optimization, Code Generation & Error Handling.

Runtime is during the execution process(Eg: Page request is made. or looping through a variable instances, etc). Runtime errors are handles after the successful compilation.