For its first CTV campaign, Jennifer Aniston’s DTC haircare brand LolaVie had a few non-negotiables. The campaign had to be simple. It had to demonstrate measurable impact. And it had to be full-funnel.

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Discover how Roku Ads Manager helped LolaVie drive big sales and customer growth with self-serve TV ads.

The DTC beauty category is crowded. To break through, Jennifer Aniston’s brand LolaVie, worked with Roku Ads Manager to easily set up, test, and optimize CTV ad creatives. The campaign helped drive a big lift in sales and customer growth, helping LolaVie break through in the crowded beauty category.

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Web3 promises a decentralized internet where users control their assets, identity, and data. But what makes this possible is not just blockchain itself. The real engine behind Web3 applications is smart contracts.

Smart contracts automate trust. They replace intermediaries with code. They enable decentralized finance, NFTs, DAOs, and countless other Web3 innovations.

In this guide, you will learn how smart contracts power Web3, how they work, and why they are fundamental to the future of the internet.

A smart contract is a self-executing program stored on a blockchain.

It automatically runs when predefined conditions are met. Once deployed, it cannot be easily altered, and it operates without human intervention.

Think of a smart contract as digital code that enforces rules transparently and automatically.

For example:

If a buyer sends cryptocurrency, then ownership of a digital asset transfers automatically.

No middleman is required.

Web3 is built on decentralization. That means removing centralized authorities.

Smart contracts make this possible by:

• Automating agreements
• Enforcing rules without intermediaries
• Executing transactions instantly
• Creating transparent systems
• Enabling programmable money

Without smart contracts, blockchain would only record transactions. With smart contracts, it becomes programmable infrastructure.

Developers write smart contract code that defines rules and conditions.

Example rules:

• Transfer tokens when payment is received
• Allow voting for token holders
• Issue rewards based on participation

Once uploaded to the blockchain, the smart contract becomes part of the decentralized network.

It cannot be edited easily and operates exactly as programmed.

Users connect through crypto wallets and trigger functions inside the smart contract.

The blockchain verifies transactions and executes logic automatically.

Every action is recorded on the blockchain.

This ensures transparency, security, and trustless interaction.

Smart contracts power lending, borrowing, trading, and staking without banks.

When you supply crypto to a lending protocol, the smart contract manages interest calculations and loan issuance.

Smart contracts create and transfer ownership of non fungible tokens.

They ensure authenticity and automate royalty payments to creators.

Decentralized Autonomous Organizations rely on smart contracts for governance.

Voting rules, treasury management, and proposal execution are handled through code.

In Web3 games, smart contracts manage token rewards, ownership of in game items, and marketplace transactions.

Players truly own digital assets through blockchain enforced contracts.

• No intermediaries
• Faster transactions
• Lower operational costs
• Transparent rule enforcement
• Immutable and secure logic
• Global accessibility

They create systems that operate independently of centralized control.

Smart contracts are powerful but not perfect.

• Coding errors can cause vulnerabilities
• Exploits can result in financial loss
• High blockchain fees during congestion
• Difficult to modify once deployed
• Regulatory uncertainty

Security audits and careful design are critical.

Smart contracts introduce the concept of programmable trust.

Instead of trusting institutions, users trust transparent code.

This is a major shift in how agreements, finance, governance, and digital ownership operate.

As Web3 evolves, smarter and more scalable contract systems will power increasingly complex decentralized ecosystems.

Smart contracts power Web3 by automating trust, enabling decentralized applications, and removing intermediaries.

They transform blockchain from a simple transaction ledger into programmable infrastructure.

From DeFi to NFTs to DAOs, nearly every Web3 innovation depends on smart contracts.

Understanding smart contracts helps you understand the true engine driving decentralization.

Web3 runs on code. Smart contracts are that code.