Meaning of the word "hold the key" in English

What does "hold the key" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

hold the key

US /hoʊld ðə kiː/
UK /həʊld ðə kiː/
"hold the key" picture

Idiom

to have the power or control over something; to have the solution to a problem

Example:
The new technology might hold the key to solving the energy crisis.
The CEO alone holds the key to the company's future decisions.