Introduction

When you buy or trade digital currency, you normally interact with an exchange. There are two main types:

• Centralised exchanges (CEX)
• Decentralised exchanges (DEX)

Each comes with different levels of control, convenience, and responsibility. This lesson helps you see the differences clearly — without jargon.

1. What is a centralised exchange (CEX)?

A centralised exchange is a company that holds your funds, manages your account, and handles the trading for you.

• You create an account.
• You verify your identity (KYC).
• You deposit money into the company’s custody.
• They execute trades on your behalf.

Examples include well-known regulated platforms (not listed here, for neutrality).

2. What is a decentralised exchange (DEX)?

A decentralised exchange is a set of smart contracts on a blockchain where users trade directly from their own wallets.

• No account creation.
• No identity checks.
• No one holds your funds except you.
• Trades happen wallet-to-wallet.

3. Key differences at a glance

• Custody: CEX holds your funds; DEX leaves funds in your wallet.
• Ease of use: CEX is usually simpler; DEX requires basic wallet knowledge.
• Regulation: CEX is regulated; DEX usually is not.
• Privacy: CEX requires identity; DEX does not.
• Control: CEX means trust the company; DEX means trust yourself.

4. Advantages of centralised exchanges

• Simple onboarding for beginners.
• Customer support and guidance.
• Ability to deposit local currency easily.
• Lower risk of user error during withdrawals.

Most people buy their very first digital currency through a CEX because the experience feels familiar — like online banking.

5. Risks of centralised exchanges

• The company holds your keys (custodial risk).
• Your funds may be frozen during investigations or outages.
• Withdrawals sometimes pause during high-traffic events.
• Company failure or hacks can impact customers.

These are not guaranteed problems, but they are risks worth knowing.

6. Advantages of decentralised exchanges

• You stay in control of your own funds.
• No company between you and the blockchain.
• Usually global access, no identity checks.
• Often more transparent — everything on-chain.

Many experienced users prefer DEXs for these reasons once they understand wallets and seed phrase safety.

7. Risks of decentralised exchanges

• User mistakes can be costly (wrong network, wrong address).
• Fake tokens and scams can appear more easily.
• Fees may vary and depend on network congestion.
• No customer service — you are your own support team.

A DEX is powerful but not beginner-friendly until you've practised with small amounts.

8. When to use each one

Neither type is “better”. The choice depends on the situation:

• Use a CEX for buying your first coins, converting money, or keeping things simple.
• Use a DEX when you’re comfortable with wallets, want full control, or prefer privacy.

Most real-world users eventually use both, depending on the purpose.

Your next steps

Now that you understand the two types of exchanges, the next lesson will teach you how to correctly read fees, networks, and confirmations — three of the most common areas where beginners make avoidable mistakes.

• Lesson 9 – How to Read Fees, Networks & Confirmations