Possible is an adjective meaning able to be done or achieved.
Common usages include:
1. "Is it possible to finish this today?" - 询问可行性
2. "That's not possible!" - 表示不可能
3. "I'll do everything possible to help" - 表示尽最大努力
Other meanings:
1. In philosophy, refers to modal logic concepts
2. In mathematics, describes potential solutions
3. Colloquially used as "as much as possible"