Types, characteristics and uses of digital currencies, including: digital/electronic currency, virtual currency, cryptocurrency, central bank digital base money, stored value cards, centralised systems (debit, credit cards, electronic point of sale), decentralised systems (Bitcoin, Litecoin, peer-to-peer electronic monetary systems, mobile electronic wallets)

Cellular networks, including: structure of a cellular network, use of 3G, 4G and 5G systems for mobile communications