Action
An action refers to a legal proceeding or lawsuit.
An action can be of a civil nature, or criminal, or administrative...
It simply means taking a problem to court or to a legal authority to get help. It's like children asking a teacher or parent to help solve a problem, but instead, as an adult, you put the same thing in a more sophisticated way: you petition a court for redress of grievances.
Legal action refers to the process of resolving disputes or enforcing rights through the court system or other legal channels. It typically involves one party filing a lawsuit or claim against another to seek remedies such as financial compensation, contract enforcement, or other legal relief.
For example, if a business partner fails to fulfill their obligations under an agreement, the other party may take legal action to recover their losses, or to enforce the terms of the contract.