Digital currencies are a brand new asset class, designed to work as a medium of exchange. Records of ownership are stored on a computerised ledger, using cryptography to keep them secure. Cryptocurrency typically does not exist in physical form and is 'decentralised', meaning it isn't issued by a central authority.
A highly volatile investment with potentially high returns, crypto is not for the faint hearted! I work with a cryptocurrency specialist who can introduce you to a low-cost, smartphone application to purchase and trade various digital currencies.