Inversion of Control is a way of designing code to implement the Dependency Inversion Principle. In it the custom code written for the functionality of the application does not control the flow of control. Instead that is received from a more generic framework.
If you regularly do software development in a higher level language, you’ll eventually run into a situation where you have to deal with the sort of problems that higher level languages are built to avoid. These problems may cause application crashes, data corruption, or performance problems until you get them sorted out. Worst of all, your experience in the higher-level language can often work against you in a lower-level one.