What are hydrocarbons?

Explanation

### Step-by-Step Solution:

1. **Definition of Hydrocarbons**:
- Hydrocarbons are organic compounds that consist entirely of hydrogen (H) and carbon (C) atoms. They are the simplest form of organic compounds and serve as the foundation for more complex molecules.

2. **Types of Hydrocarbons**:
- Hydrocarbons can be classified into three main categories based on their structure and bonding:
- **Alkanes**: These are saturated hydrocarbons, meaning they contain only single bonds between carbon atoms. An example of an alkane is ethane (C2H6), represented as CH3-CH3.
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