1. **Stating the problem:** Simplify or understand the expression involving the square root function $\sqrt{x}$. 2. **Formula and rules:** The square root function $\sqrt{x}$ is defined as the non-negative number which, when squared, gives $x$. It is only defined for $x \geq 0$ in the real numbers. 3. **Intermediate work:** Since the expression is just $\sqrt{x}$ with no further operations, it remains as is. 4. **Explanation:** The square root symbol $\sqrt{\cdot}$ means "what number multiplied by itself equals the inside value?" For example, $\sqrt{9} = 3$ because $3^2 = 9$. 5. **Final answer:** The expression is simply $\sqrt{x}$, valid for $x \geq 0$.