Being front-line staff they are most likely to detect and stop fraudulent transactions in order to prevent losses at a bank (counterfeit currency and cheques, identity theft, confidence tricks, etc.). The position also requires tellers to be friendly and interact with the customers, providing them with information about customers' accounts and bank services.
Frontline staff are often the first to detect and stop fraudulent transactions at a bank, which can result in financial losses (counterfeit money, checks, identity theft, confidence scams). This role also involves interacting with customers, providing account information, and explaining bank services.