Substance

Substance refers to the essential nature or underlying reality of something. It denotes the material or components that make up an object, or the core idea behind a concept. In philosophy, it distinguishes between what is permanent or fundamental in an object versus its changing properties. In everyday terms, it's what gives things their identity and significance. For example, in a conversation about a book, the substance might refer to its main themes or ideas, rather than just the cover design or sensory details. Understanding substance helps us grasp what truly matters in various contexts.