An eSIM (embedded SIM) is a digital SIM card that is embedded inside a device, such as a smartphone, tablet, or smartwatch. Unlike a traditional SIM card that needs to be physically inserted into a device, an eSIM is programmed with the necessary information and can be activated remotely by a carrier.

eSIMs offer several advantages over traditional SIM cards, including the ability to switch carriers without needing to physically swap out the card, and the ability to have multiple profiles on a single device. eSIMs are also useful for devices with limited space, as they eliminate the need for a physical SIM card slot.

However, not all devices support eSIMs, and not all carriers support eSIM activation. It's important to check with your device manufacturer and carrier to see if eSIM is an option for your device and service plan.