A quick overview of financial services(through TV commercials)

By providing on-demand deposit/withdrawal facility(typically our savings account), banks facilitate movement of money in the economy (called liquidity). It's an important function for economic activity as all of us remember the times of 2008 when "liquidity" in US economy dried up because people were skeptical of doing anything with their money. This TVC from Axis bank nicely summarizes the role of banks in providing liquidity in the economy:

Besides plain banking, there are several other financial provided by banks or other non-banking financial companies:
  Insurance, Loans, Mutual Funds
  Investment Banking: savings account for corporate
  Wealth management: savings accounts for very rich people
  Broking: facilitating trade by bringing interested parties with complementary needs together(much like the house broker)

This TVC from Religare gives a good overview of these activities:

- Abhishek Kumar