eSIMs (or SIM cards) are how our devices connect to mobile networks. Without any form of SIM, your device is at the mercy of the nearest Wi-Fi network.
Once you activate an eSIM data plan in your device, it will connect to a local carrier so you have internet access without relying on Wi-Fi (or trying to connect to your usual carrier and paying $$$ roaming charges).
What’s great about eSIMs is that you can purchase them, install them, and activate them virtually without visiting in-person stores or kiosks. Everything can be done with a few screen taps, including topping up your data or adding new packages.