To create Many-to-many relationship in Prisma, you do it like so. Prisma, in the background, will create a table for you with a relation.

model Category {  
  id    String @id @default(cuid())  
  title String  
  products  Product[]  
}  
  
model Produt {  
  id    String @id @default(cuid())  
  name  String  
  categories Category[]  
}