core

In general knowledge, "core" refers to the central, most important part of something. For example, in a discussion about a subject, the core concepts are the fundamental ideas that everything else is built upon. In science, the core of the Earth is its innermost layer, consisting mainly of iron and nickel, which plays a crucial role in the planet's magnetic field. Overall, understanding the core of an issue or topic helps clarify its essence and significance, allowing for deeper comprehension and effective communication.