What is eCash used for?

Could you possibly elucidate, in brief, the primary uses of eCash? I'm quite curious to understand its functionality and applications in the realm of digital transactions. Is it primarily utilized for online purchases, peer-to-peer transactions, or does it serve a more diverse set of purposes? Additionally, how does it differ from traditional forms of electronic payment methods? I'm eager to gain a deeper understanding of this innovative form of currency.