An eSIM card, short for embedded SIM card, is a digital SIM technology that eliminates the need for a physical SIM card in mobile devices such as smartphones, tablets, smartwatches, or laptops. Unlike traditional SIM cards that are removable and can be swapped between devices, an eSIM is embedded directly into the device's hardware.

The eSIM technology enables users to switch between different mobile network operators without physically changing SIM cards. It provides convenience and flexibility by allowing users to activate or switch to a new mobile network through a software-based process. This can be done by scanning a QR code provided by the network operator or through a mobile app.

As for the term "European eSIM card," it refers to an eSIM card specifically designed for use within the European region. European eSIM cards are compatible with European mobile network operators and conform to the technical specifications set by regional regulatory bodies. They enable users to connect to mobile networks within European countries without needing a physical SIM card and offer the same benefits and features as eSIM cards used in other parts of the world.