That's a common misconception! While Albert Einstein is most famous for his theories of **special relativity** and **general relativity**, he did **not** win the Nobel Prize for them.

Einstein was awarded the **Nobel Prize in Physics in 1921** for:

**"his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."**

The photoelectric effect was a groundbreaking explanation of how light can knock electrons out of a metal's surface. This discovery was crucial in the development of quantum mechanics.

So, while his relativity theories are incredibly important and revolutionary, the Nobel committee chose to honor him for his work on the photoelectric effect.
