An eSIM (embedded SIM) is a digital version of a traditional SIM card that is built directly into a device, such as a smartphone or tablet. Unlike physical SIM cards, an eSIM doesn’t need to be inserted — instead, users can activate a mobile plan by scanning a QR code or through an app. This makes it especially convenient for travelers, international students, and people on the move, as it allows for instant connectivity without waiting for delivery or visiting a store. eSIM-compatible devices can also support multiple mobile plans at once, providing added flexibility and eliminating the need to swap physical SIM cards.