A bank being a financial institution creates wealth by deposits. Deposits are created by lending funds either directly or indirectly into market and reclaiming with interests or profits. A role of bank is importance in financial system for any country, they are exceedingly regulated by the central government or national bank.
Mainly commercial banks are into managing withdrawals, deposits, lending short-term loans, home loans, mortgage loans, etc where consumer is mostly focus toward checking and savings accounts where as Investment banks primarily focus into services like underwriting, assisting to governments, corporations in investments and raising large amount of funds, etc.
Now a days, mostly all banks have their online presences. In online banking customer can manage withdrawals, deposits, loans, funds, etc from online banking account by using mobile banking solution or financial management systems or banking online website.