What is an altcoin? A guide to the most future-proof coins following Bitcoin

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Altcoins are not just a replacement for Bitcoin—they're revolutionizing the future of digital finance and technology in fresh and creative ways.

Altcoins, or "alternative coins," are all other cryptocurrencies but Bitcoin. Though Bitcoin was the first and remains the most recognised cryptocurrency, there have been thousands of altcoins since 2009.

Some are trying to take advantage of the weaknesses of Bitcoin, and others have a completely different purpose—housing decentralised apps, supporting private transactions, or even protecting real-world assets.

How altcoins differ from Bitcoin

Bitcoin was originally developed as a store of value digitally and decentralised money. Altcoins, however, introduce new features or are designed for specific purposes. Smart contracts, for instance, were brought with Ethereum, which enables programs to execute on the blockchain automatically without human involvement. Litecoin, however, was developed as a speedier, lighter version of Bitcoin. Anonymity coins such as Monero and Zcash hide transaction details to offer anonymity.

There are some altcoins that are Bitcoin code forks—altered codebases operating on a segregated network. Others, such as Ethereum and Solana, were created from the ground up and bring entirely new infrastructure to the table. This variety is what makes altcoins such a thrilling aspect of the changing crypto landscape.

Why altcoins matter

Altcoins play an important role in determining the limits of what can be done with blockchain technology. They are mainly used as labs for innovation where Bitcoin cannot be applied because of its conventional means of upgrading. Most platforms on top of blockchain utilize their own altcoins as a means of charging transaction fees, rewarding members of the network, or fuelling applications. This has created a successful and diversified digital economy with coins possessing specific uses other than payments.

Investors are also attracted to altcoins due to their potential for return. Bitcoin may be safer, but altcoins are riskier and thus can be a higher reward or a higher risk. That is why investors hedge their portfolio with a combination of Bitcoin and some altcoins.

Best altcoins to know in 2025

Ethereum is still the biggest altcoin by market cap and usage due to its leadership in decentralized apps and smart contracts. Solana has also been becoming increasingly popular based on its speed and reduced costs per transaction, and thus is highly sought after for NFT applications and DeFi use. Cardano, Polkadot, and Avalanche are a few of the other giants, each having its own different method of scaling and securing.

And then there are meme coins such as Dogecoin and Shiba Inu, which began as a joke but developed into actual communities and market backing. While these can be extremely speculative, how mainstream they become reflects the extent to which culture and community today shape crypto markets to the same extent as technology does.

The future of altcoins

As blockchain extends into spaces such as games, finance, and the metaverse, altcoins will be at the forefront of that expansion. But with so many coins out there, not all of them were designed to last. Users and investors have to watch for development activity, real-world use, and longevity.

Altcoins began life as alternatives to Bitcoin, but a number of them are forging their own directions in creating a new path for the exchange of value and information on the internet. All those who want to look beyond Bitcoin and explore the wider universe of cryptocurrency should be aware of them.