What Is a Derivative? Exchange, OTC, and Underlying Assets

Here is a sentence that changed how I see financial markets: most of what gets traded every day is not actual stocks, gold, or oil. It is contracts about those things.

A contract that says "I agree to buy 100 barrels of oil at $70 each, three months from today." A contract whose price rises and falls with the oil price, but where no oil has changed hands yet. A contract whose value is derived from something else.

Orange juice gets expensive when oranges get expensive. The juice derives its value from the fruit. Financial derivatives work the same way.

A derivative is a contract whose value comes from the price of an underlying asset.

The Underlying Asset

The underlying can be any of these:

Stock -- a share in a company (e.g. Apple, Reliance)
Bond -- a debt instrument with fixed payments
Commodity -- oil, gold, wheat, natural gas
Currency -- USD/INR, EUR/USD exchange rates
Interest rate -- the rate at which money is borrowed
Market index -- Nifty 50, S&P 500

The derivative itself has no value independent of the thing it tracks.

There are four main types. One question separates them all: are you obligated, or do you have a choice?

Forward -- you locked in a price before the deal happened. Say you are an airline. Jet fuel costs $70 today, but you need it in three months. You call a supplier and say: "Sell me 10,000 barrels at $70, delivery in 90 days." The supplier agrees. That handshake is a forward contract. When day 90 arrives, you buy at $70 no matter what the market price is. Doesn't matter if fuel crashed to $50 or spiked to $100 -- you both must honor the deal. It is a private agreement, no exchange involved, fully customized.

Futures -- same idea, but the exchange runs it. A futures contract is a forward that has been standardized and moved onto an exchange. Instead of calling a supplier, you buy an oil futures contract on the CME. The size is fixed (1,000 barrels), the expiry date is fixed, everything is fixed. And here is the key difference from a forward: you do not wait until expiry to settle. Every single day, if oil moves up $1, $1,000 lands in your account. If it drops $1, $1,000 leaves. By the time expiry arrives, the total profit or loss has already been paid out day by day. A clearing house sits in the middle guaranteeing every trade.

Options -- you paid for the right to change your mind. Same airline, same fuel problem. But instead of locking in $70, you pay a small premium -- say $2 per barrel -- for the option to buy at $70 anytime in the next 90 days. If fuel spikes to $100, you exercise your option and buy at $70. You saved $28 per barrel minus the $2 premium. If fuel drops to $50, you do nothing. You let the option expire and buy cheap fuel on the open market. Your only loss is the $2 premium you paid. The buyer has the choice. The seller is obligated to honor whatever the buyer decides.

Swaps -- forget buying an asset entirely. Two parties simply exchange cash flows over time. No asset changes hands. It is a long-running agreement about money, not ownership.

The key is that both sides have opposite problems. Neither one is doing the other a favour -- both are getting exactly what they need.

Say you are a company that borrowed money at a floating rate. Your loan repayment changes every quarter as interest rates move. You are scared rates will rise and your cost will keep climbing. You want certainty -- a fixed payment you can plan around.

The bank across the table has the opposite problem. They lent money to many customers at fixed rates -- say 7%. They locked in 7% income for ten years. But if market rates rise to 9%, they are stuck earning only 7% while the rest of the market earns 9%. They want to swap their fixed income for floating income so they can benefit when rates rise.

You both agree: every quarter, you pay the bank 7% fixed, and the bank pays you whatever the floating rate is.

Quarter	Floating rate	You pay bank	Bank pays you	Your net cost
Q1	7%	7% fixed	7% floating	7%
Q2 (rates rise)	9%	7% fixed	9% floating	7%
Q3 (rates fall)	5%	7% fixed	5% floating	7%

When rates rise to 9%, the bank pays you 9% but only receives 7% from you. The bank "loses" 2% on the swap -- but that is fine, because the bank's other borrowers are now also paying 9% on their floating loans. The bank's overall income went up. The swap loss is offset elsewhere.

Nobody loses. Both sides hedged their own risk using the other person's opposite exposure.

Nothing was bought or sold. No shares, no oil, no bonds. Just two parties exchanging payment streams every quarter.

The two-axis frame that makes this stick:

	Must transact (obligated)	Can walk away (right)
Private deal (OTC)	Forward, Swap	OTC Options
On an exchange	Futures	Listed Options

The Two Places Derivatives Are Traded

Derivatives are traded in one of two places: an exchange or over the counter (OTC).

An exchange is a centralized marketplace. The Bombay Stock Exchange and the New York Stock Exchange are exchanges. OTC is a different arrangement: a decentralized market where two parties trade directly with each other, without a central platform.

This difference shapes everything about how the contract works. Think of it like the difference between shopping at a supermarket (exchange) and making a private deal with a farmer at the market gate (OTC).

	Exchange	OTC
Contracts	Standardized -- identical for all buyers	Customized -- every term negotiable
Regulation	Heavily regulated	Lighter regulation
Default risk	Low -- clearing house guarantees both sides	Higher -- you depend on the other party
Liquidity	High -- easy to enter and exit	Low -- hard to sell a bespoke contract
Examples	Nifty futures, AAPL options	Interest rate swaps, currency forwards

Exchange: Standardized, Regulated, Guaranteed

Exchange-traded contracts share four defining features.

Standardization. Every contract is identical in terms of size, expiration date, quantity, and quality specifications. There is no negotiating. Two buyers anywhere in the world purchasing the same futures contract are buying the exact same product.

Regulation. Exchange markets are heavily regulated to ensure transparency between all market participants. Regulatory oversight tightened globally after episodes like the Harshad Mehta scandal in India and the 2007-08 financial crisis in the United States.

Clearing house. A clearing house sits between every buyer and every seller. If one party tries to walk away, the clearing house covers the other side. You never deal directly with the counterparty -- the clearing house is always in the middle.

Liquidity. Standardized contracts attract high trading volume. High volume means positions can be entered and exited easily. Standardization and liquidity move together.

OTC: Customized, Flexible, Higher Risk

OTC contracts are the opposite on every dimension.

Customization. Every term in the contract can be negotiated: size, price, maturity, underlying asset, quality. This is the primary reason institutions choose OTC.

Less regulation. OTC markets operate with less oversight. Before 2008, this created significant transparency problems across global financial systems.

Central Counterparty (CCP). Before the 2007-08 financial crisis, OTC trades happened directly between two parties with no intermediary at all. After the crisis, regulators pushed for a CCP to sit between OTC trades as well, performing the same role as a clearing house. Both arrangements still exist today.

Lower liquidity. A customized agreement is hard to sell to someone else because the terms were designed for two specific parties. The more bespoke the contract, the thinner the market for it.

Liquidity means trading volume, not cash. A liquid stock trades in high volume every day -- easy to buy, easy to sell. An illiquid OTC contract is hard to exit because the terms were negotiated for two specific parties. No one else wants it at that exact size and date.

Swaps are a good example of OTC in practice. They are one of the four main derivative types, and they trade almost entirely over the counter. Interest rate swaps, currency swaps: none of these have a standard exchange listing. Two institutions negotiate and agree directly.

The 2008 Shift

The 2007-08 financial crisis exposed what happens when large OTC positions build up with no central counterparty managing default risk. The response was regulation that pushed OTC markets toward CCP-based clearing.

In interview settings, the traditional answer is still: exchange has a clearing house, OTC does not. But the accurate answer acknowledges that post-2008, many OTC trades now also route through a CCP. Both arrangements exist, and which one is used depends on the specific trade and the parties involved.

The Essentials

A derivative derives its value from an underlying asset. The underlying can be a stock, bond, commodity, currency, interest rate, or market index. The derivative has no value independent of that relationship.
Exchange-traded derivatives are standardized, regulated, and liquid. A clearing house sits between every trade, guaranteeing performance on both sides.
OTC derivatives are customized and less liquid, with higher counterparty risk. Post-2008 regulation introduced the Central Counterparty to OTC markets, but both arrangements (with and without CCP) still exist.

Of the four derivative types, futures are the most important to understand first. They trade on exchanges, they are standardized, and they have one feature that surprises almost everyone who reads about them for the first time.