If you work in fintech — like I do — it's easy to get lost in sprints, stakeholder decks, and delivery timelines without ever stepping back to ask: what is the actual business we're building technology for? This piece is my no-jargon breakdown of how banking really works, from the ground up.
Banking is the business of accepting deposits from individuals and organizations, safeguarding their money, lending funds to borrowers, facilitating payments, and providing financial services — all while complying with regulatory requirements.
In the simplest terms: a bank is a trusted intermediary between people who have money and people who need it.
John has ₹1,00,000 in savings. Mary wants ₹10,00,000 to buy a house. Instead of John lending directly to Mary, the bank accepts John's deposit, pools it with other deposits, and lends it to Mary as a home loan.
The bank charges Mary interest, pays John a smaller interest, and keeps the difference — known as the Net Interest Margin (NIM). This intermediation is the core function of banking.
Without banks, people would have to lend and borrow directly from one another — inefficient, risky, and slow. Banks remove that friction at scale.
Through Savings Accounts, Current Accounts, Fixed Deposits (FDs), and Recurring Deposits (RDs). When you deposit ₹50,000, the bank holds it securely and may pay you interest in return.
Banks lend to individuals and businesses through Personal Loans, Home Loans, Vehicle Loans, Education Loans, Gold Loans, and Business Loans.
Modern banks move money through UPI, NEFT, RTGS, IMPS, debit cards, credit cards, and cheques — most of it now instant and digital.
Banks help customers exchange currencies and process international payments — like a student converting INR to GBP before studying abroad.
Banks also offer mutual funds, bonds, and government securities; provide wealth management and financial planning; and run treasury operations to manage liquidity, FX reserves, and interest rate risk.
| Era | Description |
|---|---|
| Ancient Banking | Merchants stored gold and valuables with trusted custodians. |
| Traditional Banking | Physical branches handled deposits, withdrawals, and loans. |
| Electronic Banking | ATMs, debit cards, and online banking were introduced. |
| Digital Banking | Mobile apps, internet banking, and digital payments became the norm. |
| Open Banking | Banks securely share customer-authorized data via APIs. |
| Embedded Finance | Financial services integrated into non-financial apps — e.g. instant loans inside e-commerce platforms. |
| Category | Examples |
|---|---|
| Deposits | Savings, Current, Fixed Deposit, Recurring Deposit |
| Loans | Home, Personal, Vehicle, Education, Gold |
| Payments | Debit/Credit Cards, UPI, Internet & Mobile Banking |
| Investments | Mutual Funds, Bonds, Government Securities, FDs |
| Term | Meaning |
|---|---|
| Balance | Money available in an account |
| Principal | Original amount borrowed or invested |
| EMI | Fixed monthly loan repayment |
| Collateral | Asset pledged to secure a loan |
| Default | Failure to repay a loan as agreed |
If a bank pays 3% interest on savings deposits and charges 8% interest on home loans, that 5% spread contributes directly to its Net Interest Margin (NIM) — the core profitability metric in banking.
Regulators protect customers and maintain financial stability by overseeing licensing, capital adequacy, customer protection, KYC (Know Your Customer), AML (Anti-Money Laundering), cybersecurity, and risk management. This is the invisible infrastructure that keeps the system trustworthy.
This is exactly where my work sits — building and delivering the technology layer that makes modern banking faster, safer, and more convenient.
Understanding banking fundamentals isn't just for bankers — it's essential context for anyone delivering fintech products. The next time you're prioritising a sprint backlog or presenting a release plan, this is the business reality sitting underneath it all.
Open to new roles, collaborations, and conversations about technology in banking.
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