According to Einstein, time is …………….

Answer

**Step-by-Step Solution:**

1. **Understanding Einstein's Theory**: Start by recognizing that Einstein's theories, particularly the Special Theory of Relativity, revolutionized our understanding of time and space.

2. **Concept of Relative Time**: According to Einstein, time is not an absolute quantity. Instead, it is relative, meaning that it can vary depending on the observer's state of motion.

3. **Frame of Reference**: The rate at which time passes can differ based on the observer's frame of reference. For example, if one observer is moving at a high speed relative to another, they will experience time differently.

4. **Time Dilation**: This phenomenon is known as time dilation. The faster an object moves, the slower time passes for it relative to a stationary observer.

5. **Conclusion**: Therefore, according to Einstein, time is what the clock reads, but it is also dependent on the observer's frame of reference and their relative velocity.

**Final Answer**: According to Einstein, time is relative and depends on the observer's frame of reference.

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