eSIM (embedded SIM) technology is revolutionizing the way we connect to mobile networks. Unlike traditional SIM cards, which are physical cards you insert into your device, an eSIM is a digital SIM embedded directly into your phone, tablet, or wearable device. This means no more swapping SIM cards when you switch carriers or travel internationally. With eSIM, you can easily switch between carriers and manage multiple phone numbers on one device without needing extra hardware.