An eSIM Card is a small integrated circuit that stores all necessary subscriber information and can be re-programmed by the user. This technology evolved from the standard SIM card to include an eUICC chip, which allows for the profiles of different operators to be downloaded and switched through software installed on the device. In this article, I’ll discuss what esim is, and how they work. Also describe how eSIM differs from physical SIM Cards, their advantages, disadvantages, and more.