Liquefied petroleum gas (LPG) is the gaseous form of two kinds of natural gases: butane and propane. It can also be a mix of the two gases. Butane and propane are similar but have different properties, making them suitable for different things.

Compressed natural gas (CNG) is natural gas that has been compressed to less than one per cent of its volume. The gas is compressed when it is stored at very high pressures.

Biogas is a renewable energy source produced when anaerobic bacteria break down organic materials. It is different from natural gas as natural gas is a fossil fuel, while biogas is a renewable energy source.