Think of it as:
* Finding something good unexpectedly: You're looking for a new recipe and stumble upon a recipe for your favorite childhood dessert while browsing a cook book.
* Lucky coincidences: You're looking for a specific book at the library and find it on the "staff picks" shelf.
* Unexpected discoveries: A scientist accidentally spills a chemical and discovers a new cure for a disease.
In essence, serendipity is about finding something good or valuable by chance or accident, often leading to something positive. It's a happy surprise that brings unexpected good fortune.