How is theme different from central/main idea?

The theme and central/main idea are two distinct literary elements, although they are often related to each other.

The central/main idea refers to the main point or message that the author wants to convey through the text. It represents the overall focus or subject of the work. It can be understood as the topic or subject matter that the author aims to explore and explain.

On the other hand, the theme refers to the underlying meaning or insight that the author presents through the text. It often reflects the universal or timeless aspects of the central/main idea and provides a deeper understanding of the text's message. Themes are typically abstract concepts that can be interpreted in various ways and may apply to different contexts beyond the specific text.

In simpler terms, the central/main idea is the explicit subject or message, while the theme is the broader, underlying concept or insight that the work conveys.