The type of compounds that always contain carbon and hydrogen are hydrocarbons.

Here's a breakdown:

* Hydrocarbons: These are organic compounds consisting solely of hydrogen and carbon atoms. They form the basis of many other organic compounds and are the primary components of fossil fuels like oil and natural gas.

* Examples of hydrocarbons: Methane (CH₄), Ethane (C₂H₆), Propane (C₃H₈), Butane (C₄H₁₀), Benzene (C₆H₆), etc.

While there are other organic compounds that contain carbon and hydrogen, hydrocarbons are the only ones that *always* contain these two elements.