What is intertextuality?

Intertextuality is about the relationships between literary texts and how they can be interconnected. This applies to all texts: novels, philosophy, religion, newspapers, films, songs, and more. In order to understand intertextuality, it’s crucial to understand this broad definition of the “text” and that every text is affected by the texts that came before it.

Intertextuality shows how a culture influences its authors while the authors in turn influence the culture. When you create art, literature, or scholarship, you are inevitably influenced by what you’ve seen or read up to that point. Even authors from different cultures and times can and will eventually influence each other.

https://literaryterms.net/intertextuality/