As with other UK banks, customers of Tesco Bank are protected by the Financial Services Compensation Scheme (FSCS), meaning a maximum of £85,000 per person is protected if the bank goes bust.
A sale will be monitored closely by the banking regulator.
In the short term, it is likely customers wouldn't notice much change.
When Co-op Bank put itself up for sale in 2017, there was no immediate impact on the products and services.
Barclays has agreed to buy the retail banking arm of Tesco Bank, including acquiring its approximately 2,800 staff.
The banking giant expects to pay roughly £600 million for Tesco Bank’s credit cards, unsecured personal loans, deposits and operating systems.
Ken Murphy, Tesco Group chief executive said: "Tesco Bank is a strong business that has helped millions of loyal customers to manage their money for more than 25 years.
"As we look to the future, our aim is to be the best provider of financial services in the UK, with this strategic transaction and partnership with Barclays unlocking greater value for customers and for our business."
Tesco Bank has said there is no need for customers to take any action, and it will be in touch with them over the coming months.
No current timeline has been issued for how long the changes will take.
The mega move will have a minimal affect on over five million customers.
Services and customers that will be affected are credit cards, loans and savings customers.
While the operation of these services will be run by Barclays, they will continue under the Tesco Bank name.
Plus, Tesco Bank will retain some of its banking actives, including insurance, ATMs, travel money and gift cards.