What are isomers? State the types of isomerism.

(N/A) Isomers are two or more compounds that have the same molecular formula but different arrangements of atoms in space or different connectivity of atoms. The phenomenon of the existence of isomers is called isomerism.
Isomerism is broadly classified into two types:
$1$. Structural Isomerism: In this type,isomers have the same molecular formula but different connectivity of atoms (different structural frameworks).
$2$. Stereoisomerism: In this type,isomers have the same molecular formula and the same connectivity of atoms,but they differ in the spatial arrangement of atoms or groups.