Meaning of the word "At the heart of" in English

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

At the heart of

US /æt ðə hɑːrt əv/
UK /æt ðə hɑːt əv/

Idiom

the most important or central part of something

Example:
At the heart of the problem is a lack of communication.
Innovation is at the heart of their business strategy.