The reward power is the capability to compensate other person for compliance. Example, A manager's authority to promote an employee.
The coercive power is the ability to punish a person in case of non-compliance. For example, if an employer forces or threats his employee to do an act whether lawful or unlawful,
If a leader is charismatic the people automatically follow him this is known as referent power. Examples of charismatic people are Pope John Paul II and President Duterte.
The expert power, under this circumstance education or experience is the essential ingredient. For example, everybody, listen to a lawyer, if there is a controversy in law.
When a person holds information that may significantly affect the decision of a person is known as informational power.