Impel and compel are two verbs often used interchangeably due to their similar meanings, but they have distinct differences in their usage and implications.

Impel: This verb means to drive, motivate, or urge someone to take action willingly, often due to inner desires or external influences. When someone is impelled to do something, they are moved by a compelling force, but they still have a sense of choice in the matter.
Example:
The inspirational speech by the coach impelled the team to give their best effort in the game.

Compel: On the other hand, compel means to force or constrain someone to do something against their will or desire. It implies the use of authority, pressure, or external factors to make someone take a specific action.

Example:
The court can compel a witness to testify under oath, even if they do not wish to do so.

In summary, the key difference between impel and compel lies in the degree of voluntary action involved. Impel suggests a more persuasive and motivational influence, while compel indicates a stronger sense of coercion and obligation. It is crucial to use these words accurately to avoid misunderstanding or misrepresenting the intended message.