An eSIM, also known as an embedded SIM, is a digital SIM that comes already built into a device’s hardware. It can be programmed with the details of a mobile network operator. On the other hand, a physical SIM card is a removable chip that you need to physically insert into the SIM card slot of a device. The main difference is that eSIMs are smaller and more convenient because they do away with the need for a physical card.
Here is the list of all eSIM supported devices from Oppo. If you need eSIM activation guide for any of this smartphones, just click on the model name.