I need a brief explanation of the concept of [concept] as it relates to [field]. The response should contain at least 2 placeholders represented by square brackets, such as [address]. Your response must have 2 paragraphs. Paragraphs are separated with the markdown divider: *** *** Explain the concept in simple terms and include an example. At the end of your response, please explicitly add a postscript starting with P.S.

user