Today, many companies selling cryptocurrency wallets have evolved to use a newer alternative to full nodes, instead relying on SPV wallets
SPV walletsEnsures transactions made from the wallet are in a block, providing confirmations that additional blocks are being added to the chain, or Simple Payment Verification wallets.
These wallets still have access to the full blockchain, but without having to store its entire contents. SPVs instead tap into other full nodes to source the information, working much more efficiently and functioning on much less computer memory.
While all cryptocurrency wallets interact with blockchains through either the full node or SPV systems, they can differ significantly in the way they store their contents. But they do market themselves on the two most important elements when users decide on which cryptocurrency wallet to use - security and convenience.