Numerous extra-talented computer programmers are very much into programming and good at hacking and cracking.
These Hackers get unauthorized access to the sensitive data or information of your computer system where all the data related to your credit cards, debit cards, bank details, and personal data is stored.
When they access this sort of important information they tend to use it against you and normally misuse it.
Imagine if your username and passwords are revealed to unknown people they can harm you socially as well as financially.