There are two types of termination — involuntary and voluntary. Involuntary termination happens when an employer initiates the contract termination as they no longer need this or that employee or do not want to continue working with them.
Voluntary termination is initiated by an employee. It includes cases when an employee resigns or chooses to end the contract. Termination types are not usually reported officially, but sometimes it is required to show the type of termination to get the paycheck corresponding to it.