Alone is an adjective and adverb meaning "separate, apart, or isolated from others".
Common usages include:
1. "I want to be alone" - expressing desire for solitude
2. "She lives alone" - indicating solitary living situation
3. "You're not alone" - offering comfort and support
4. "Leave me alone" - requesting to be undisturbed
5. "Standing alone" - describing independence or uniqueness