Folklore is the broad body of a culture’s traditional knowledge and expressive forms—stories, songs, customs, proverbs, beliefs, and practices passed along within a community. Mythology usually means the set of myths belonging to a people (or the study of those myths): sacred or foundational narratives that help explain origins, nature, ritual, and values.
In scholarly use, myth is treated as a genre of folklore—narratives that play a fundamental role in a society—often featuring gods or other supernatural beings and set in a remote or primordial past. Other folklore forms (such as many folktales) are typically secular entertainment or practical wisdom and are not treated as sacred accounts. The categories overlap: myths can become folktales as beliefs change, and folklore often carries mythological motifs.
Source: Myth / Mythology — Wikipedia