Used when highlighting the main factor that leads to a desired outcome or goal.

Goal Oriented

'Key to' is often used metaphorically rather than literally.

Figurative Use

What is 'key to' something can vary depending on the person or situation.

Emphasizes the necessary information or method to comprehend a complex issue.

Indicates a pivotal step in resolving a problem or question.

Refers to something that allows entry or usage, such as a password or code.

In a computing context, can refer to an actual 'key' like a product key or keycode.