The Ethereum network, specifically its ERC-20 standard, has become a fundamental building block for a wide range of blockchain-based applications and use cases. Here are some prominent examples:

1. Cryptocurrency Tokens: ERC-20 tokens are the most common type of cryptocurrency tokens built on the Ethereum blockchain. These tokens represent a wide variety of assets, including utility tokens for decentralized applications (DApps), stablecoins pegged to fiat currencies, and security tokens representing ownership of real-world assets like real estate or company shares.

2. Decentralized Finance (DeFi): Many DeFi projects utilize ERC-20 tokens for functions such as lending, borrowing, decentralized exchanges (DEXs), yield farming, liquidity provision, and synthetic asset creation. Examples include lending protocols like Compound and Aave, decentralized exchanges like Uniswap and SushiSwap, and derivatives platforms like Synthetix.

3. Non-Fungible Tokens (NFTs): While ERC-721 is the standard specifically designed for NFTs, Ethereum's ERC-20 tokens are often used in NFT marketplaces and platforms for various purposes, such as governance, rewards, or in-game currencies within NFT-based games and virtual worlds.

4. Tokenization of Assets: ERC-20 tokens enable the fractional ownership and tokenization of real-world assets, including real estate, art, commodities, and collectibles. Platforms like RealT tokenize real estate properties, allowing investors to own fractions of properties through ERC-20 tokens.

5. Crowdfunding and Fundraising: ERC-20 tokens are commonly used in Initial Coin Offerings (ICOs) and token sales as a way to raise funds for projects and startups. Investors purchase tokens during the token sale, providing funding to the project in exchange for tokens that may represent future utility or value.

Overall, ERC-20 tokens on the Ethereum network have become integral to a diverse range of applications and use cases, spanning from finance and governance to gaming and asset tokenization, driving innovation and adoption within the blockchain ecosystem.