while is a conjunction in English that means "during the time that" or "at the same time as".
In programming, while is a loop statement that executes a block of code as long as the condition is true.
The term "while" can also be used as a noun meaning "a period of time".
Common expressions with while:
1. "Once in a while" - occasionally
2. "Worth one's while" - worth the time or effort
3. "While loop" - a programming construct