There are many different kind of cloud, but there are only three main groups, cirrus, stratus and cumulus.
This picture shows you the three types with one extra, a kind of cumulus cloud known as cumulo-nimbus.
Recently some scientists have said that the cloud in the top picture cannot be described by the three types, and it should have its own name.
They have called it asperatus, which is from Latin, meaning ‘to make rough’. And it sure looks rough! I wouldn’t like to be walking around without an umbrella under these clouds.
And if you want to see another picture of asperatus cloud here you are:
And there is another here.