In organic chemistry, isomers are molecules with the same molecular formula (i.e. the same number of atoms of each element), but different structural or spatial arrangements of the atoms within the molecule.
The reason there are such a colossal number of organic compounds – more than 10 million – is in part down to isomerism. This graphic can be filled in by students who are learning this topic.
https://cramnow.com/tool-box/organic-chemistry/organic-isomerism-infographic-blank