product custom option programmatically

How to show product custom option into custom page in Magento 2

With custom options, it’s added some additional features for simple, configurable, downloadable and virtual products in Magento 2. This enable the creation of product variations. Bundle product and grouped product not support custom options. when we are adding custom options to the product then we get the more opportunity to make our product more flexible. Product with custom options are not configurable product. Product with custom options not change product type.