Answer the following questions in one word or one sentence:
What is the common name of sodium hydroxide?

Explanation

**Step-by-Step Solution:**

1. **Identify the Chemical Compound**: The question asks for the common name of sodium hydroxide, which is chemically represented as NaOH.

2. **Understand Properties**: Sodium hydroxide is known to be an alkali and is highly soluble in water. It is also a white solid and has a corrosive nature.

3. **Common Names**: Due to its properties, sodium hydroxide is commonly referred to as "caustic soda." It is also known by another name, "lye."

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