Final answer:
The PS5 Digital Edition lacks a disc drive and is made solely for digital use. PS4 games are compatible with the PS5 but must be digital versions to be played on the PS5 Digital Edition. Physical PS4 games cannot be used with the digital-only console.
Step-by-step explanation:
The PS5 Digital Edition does not have a disc drive and is designed exclusively for digital content. This means that it cannot read discs of any kind including PS4 discs. However, it's important to clarify that PS4 games are compatible with the PS5 but in order for you to play PS4 games on a PS5 Digital Edition, they must be digital versions purchased from the PlayStation Store or transferred from a PS4 console digitally.
So if you have digital versions of your PS4 games or are willing to purchase them, you will be able to enjoy playing them on the PS5 Digital Edition. It's also worth mentioning that the PS5 Digital Edition often has the same internal specs as the standard PS5, just without the physical disc drive for playing games, Blu-rays, or DVDs.