What is customer id in bank account

A Customer ID is a unique numerical identifier assigned by a bank to an individual account holder. Unlike an account number which identifies a specific pool of funds, the Customer ID identifies the person and links all their different accounts—such as savings, current, or loan accounts—under one profile. Its primary functions include:

• Acting as a primary credential for logging into internet and mobile banking platforms.
• Helping bank officials quickly verify your identity during customer service interactions.
• Consolidating all banking relationships into a single view for easier financial management.