Different kinds of oils
There are three kids of oils: saturated, mono-unsaturated and poly-unsaturated. Saturated oils are solid at room temperature. Mono-unsaturated oils are fluid at room temperature but solid in the refrigerator. Poly-unsaturated oils are fluid at room temperature and in the refrigerator.
However, all oils contain a mixture of the above three kinds of oils. Below I've highlighted some common oils and their fatty acid contents: