A more thorough explanation:

Definition: To forbid by law or prevent/hinder.

Examples:

• The law prohibits smoking in public places.
• The school prohibits students from using their phones during class.
• The company prohibits employees from sharing confidential information with outsiders.

These examples illustrate how something is not allowed or is prevented from happening. In the first example, smoking in public places is forbidden by law. In the second example, students are prevented from using their phones during class to ensure they are paying attention. In the third example, employees are prohibited from sharing confidential information to protect the company's interests.