A core banking system is the central software a bank runs its essential operations on \u2014 accounts, deposits, loans, payments, and the general ledger \u2014 processing transactions and updating balances in real time. Many banks still run cores built decades ago, while newer ones are cloud-native and expose their functions through APIs.<\/p>\n\n\n\n
Almost every fintech product eventually has to read from or write to a core system, and an aging one can make even a simple feature a months-long integration. Replacing a core outright is high-risk and slow, which is why most banks modernize around it instead of swapping it out in one go.<\/p>\n\n\n\n