DeFi has been getting a lot of attention lately, but honestly, many people still don't really understand what it is. Even if you're told that you can use financial services without a bank, it's natural to find it hard to picture exactly how things will change.

Actually, DeFi refers to "Decentralized Finance," which are programs on the blockchain that serve the role of banks. It exploded in popularity around 2020, and the market continues to expand, mainly around Solana and Arbitrum. In Japan, the Financial Services Agency is working on regulatory frameworks, so it’s a good idea to grasp the basics now.

## A Simple Explanation of What DeFi Is

DeFi stands for "Decentralized Finance." The key point is "decentralized," meaning financial services operate without a central authority like a bank or securities firm.

The essence of DeFi is a financial system that replaces traditional banking functions with programs. Usually, borrowing money involves going through a bank’s screening process and paying interest. But in DeFi, this "bank" part is handled automatically by programs on the blockchain (smart contracts), completing transactions according to predefined rules without human approval or judgment.

As long as you have internet access, you can use DeFi from anywhere in the world, even without a bank account. It operates 24/7, which is a major feature.

## Why Was This System Created?

Do you remember the 2008 Lehman Brothers collapse? It revealed how fragile centralized finance can be. That same year, a person named Satoshi Nakamoto published the Bitcoin white paper, proposing a "peer-to-peer payment system" that doesn’t rely on banks.

This idea further developed, and in 2015, Ethereum was launched. With smart contracts implemented, it became possible to decentralize not just payments but all kinds of financial services.

Then, in the summer of 2020, during what’s called the "DeFi Summer," Compound introduced liquidity mining, which triggered a rapid growth in the total value locked (TVL) in DeFi—rising from just $1 billion to over $15 billion in a few months.

## The Technology Behind DeFi

Blockchain and smart contracts are the two core technologies supporting DeFi.

Blockchain is a distributed database that links transaction data in "blocks," maintained by participants worldwide. No single entity controls it; instead, the entire network maintains the records, making it resistant to tampering and highly transparent.

Smart contracts are programs that automatically execute when certain conditions are met. Think of a vending machine: insert money, press a button, and a drink comes out without anyone’s intervention. Similarly, when conditions are fulfilled, the contract runs automatically.

## The Benefits and Attractions of DeFi

Lower fees and faster transactions. Since there are no middlemen, transaction costs are significantly reduced. International remittances can sometimes be done in a fraction of the time of traditional banks, and on some chains, transactions are completed in seconds.

It’s accessible 24/7 from anywhere in the world. Automated programs mean no dependence on business hours or maintenance schedules.

No personal information is required, allowing for anonymous use. Most DeFi services don’t require identity verification; you just need a wallet address.

Anyone can become a "provider." Unlike traditional finance, you can supply liquidity or lend funds and participate as a service provider.

## Risks to Keep in Mind

Smart contracts can have bugs or vulnerabilities that hackers exploit. If there’s a flaw in the code, malicious actors can attack it. There have been cases with losses of hundreds of millions of dollars, and even audited protocols aren’t guaranteed to be completely safe.

High gas fees are another issue. On Ethereum, network congestion can cause a single transaction to cost hundreds of dollars. For small transactions, fees might outweigh the profits, so caution is needed.

In addition to the price volatility of cryptocurrencies, providing assets to liquidity pools carries the risk of "impermanent loss," which can lead to losses.

Regulatory frameworks are still developing. When problems occur, legal remedies are limited, and users are generally responsible for their own risks.

Scams and rug pulls (exit scams) are also common. Many developers abandon projects or run away with funds after raising capital. Participation in unverified protocols without audits requires caution.

## How to Start with DeFi

First, buy Ethereum (ETH) on a domestic cryptocurrency exchange. Most DeFi applications run on Ethereum or EVM-compatible chains, and each transaction requires ETH for "gas" fees. Currently, ETH is around $2,050. Major exchanges in Japan include bitFlyer, GMO Coin, and Coincheck.

Next, set up a wallet like MetaMask. It’s free and available as a browser extension or mobile app. After installation, you'll see a seed phrase (12–24 words). Losing or leaking this phrase means losing access to your assets forever. Store it securely offline.

Transfer ETH from your domestic exchange to your MetaMask wallet address. The address starts with "0x" followed by alphanumeric characters. Even a small mistake can make it impossible to recover your assets. Always copy and paste the address, and verify the first and last few characters visually.

Once ETH arrives in your wallet, visit a DEX site (like Uniswap), connect your MetaMask, and you can start swapping tokens, lending, or providing liquidity immediately.

## How to Earn with DeFi

Lending is the easiest for beginners. Deposit cryptocurrencies into protocols like Aave or Compound and earn interest from borrowers. For example, Aave’s token (AAVE) is currently about $93.85. Lending stablecoins can be a good entry point because it reduces price fluctuation risks while earning interest.

Providing liquidity is another option. Deposit asset pairs (like ETH/USDC) into a DEX liquidity pool, and earn a portion of trading fees each time a trade occurs. However, be aware of the risk of impermanent loss, and make sure to understand the mechanism thoroughly before starting.

Investing in DeFi-related tokens is also possible. Hold governance tokens issued by protocols to benefit from the overall growth of the DeFi market. For example, Uniswap’s governance token (UNI) is about $3.33. Since individual token prices can fluctuate significantly, consider your risk tolerance before investing.

## DeFi Trends for 2026

The Solana ecosystem is rapidly gaining momentum. Its fast processing speed and low gas fees are highly valued, especially for meme coin trading, with increasing transaction volume on Solana DEXs. Currently, SOL is around $79, with Jupiter and Raydium emerging as leading protocols.

Integration with RWA (Real-World Asset Tokenization) is also attracting attention. Traditional assets like stocks, bonds, and real estate are being tokenized on the blockchain and made tradable via DeFi. Ondo Finance is a pioneer, partnering with major wallets and expanding this movement.

In Japan, the Financial Services Agency is working on regulations covering DeFi and cryptocurrencies. In the U.S., discussions about DeFi regulation are active, and regulatory developments could significantly impact the market environment depending on how they unfold.

## In Conclusion

Simply put, DeFi is a decentralized financial system where smart contracts on the blockchain replace traditional banks. It offers low fees, 24/7 access, and no need for personal info, but also comes with risks like hacking and regulatory uncertainties.

DeFi is entirely at your own risk. It’s strongly recommended to start small, with funds you can afford to lose, and to proceed within your comfort zone.