Product with the custom option available Out of the box in Magento 2. You can add, delete or update custom option of a product using an admin panel or creating a script by programmatically.
You can check the relation for each custom option table with another table in Magento 2.3
catalog_product_option is the primary table to manage Custom Option related data for a product. Continue reading “Product Custom option table relation with other entity in Magento 2”