eSIM is the technological replacement for physical SIM cards. Since 2018, the majority of Apple, Samsung and Google mobiles and tablets have been manufactured with eSIM (embedded SIM) as standard. Over the next decade, plastic SIM cards will disappear for consumer devices.
In practice this means no more plastic SIM cards getting lost or damaged. No more jamming paper clips or stickers into the side of a €1,000 phone.
eSIMs are easily provisioned over the air, either by scanning a QR code, selecting a data plan manually in mobile data settings, or clicking a link.