What's the difference between during and while?

During

Definition:

• (prep.) In the time of; as long as the action or existence of; as, during life; during the space of a year.

Example Sentences:

While

Definition:

• (n.) Space of time, or continued duration, esp. when short; a time; as, one while we thought him innocent.
• (n.) That which requires time; labor; pains.
• (v. t.) To cause to pass away pleasantly or without irksomeness or disgust; to spend or pass; -- usually followed by away.
• (v. i.) To loiter.
• (conj.) During the time that; as long as; whilst; at the same time that; as, while I write, you sleep.
• (conj.) Hence, under which circumstances; in which case; though; whereas.
• (prep.) Until; till.

Example Sentences: