Metaphor in philosophy is when we use words or phrases that describe something else to help explain an idea or concept that may be difficult to understand.
For example, sometimes people describe the mind as a "computer" to explain how it processes information just like a computer does. Similarly, we might describe love as a "rollercoaster" to explain the ups and downs of emotions that come with feeling love.
This is done because sometimes concepts can be difficult to grasp or communicate. By using metaphors, we can help people understand complex ideas in a simple way. It's like drawing a picture to explain something - it makes it easier for your brain to understand.