What is the main distinguishing feature(s) for T and E cards?

The main distinguishing features of T and E cards lie in their intended usage and the type of transactions they facilitate. T cards, or travel cards, are primarily designed for travel-related expenses, offering benefits such as rewards on travel purchases. E cards, or electronic cards, are typically used for online transactions, providing convenience and enhanced security for digital payments. Both card types may offer unique rewards and features tailored to their specific purposes.