What is Non-Deterministic (ND) Wallet?

A non-deterministic (ND) wallet is a type of non-custodial cryptocurrency wallet that is made to generate, store, and manage numerous private keys that are independent from each other. Non-deterministic wallets often store their private keys in pairs (because they utilize randomness) and were developed shortly after the Bitcoin blockchain network first went live. The main problem with ND wallets is that their backup keys must be created each time a new wallet is created. This problem was later mitigated by wallets that made use of BIP-32 technology (a deterministic key generator).