Cardano (ADA) is a Layer 1 blockchain and one of Ethereum's older rivals, known for a slow, research-driven approach — every major change is based on peer-reviewed academic papers before it ships. It runs smart contracts and uses proof-of-stake (ADA holders stake to help secure the network and earn rewards). Its pitch is security, rigor and long-term sustainability over speed of shipping. ADA is used for staking, transaction fees and governance (holders vote on how a community treasury spends its funds). Supply is capped at 45 billion coins.
Where it stands today: Cardano has largely delivered its technical roadmap but not the adoption its community hoped for — critics call it a 'ghost chain' that produces academic papers faster than real users. It trades far below its 2021 peak. Its scaling layer 'Hydra' and upgrades like 'Leios' are progressing (mostly in testing and rollout through 2026) to raise throughput, and it now runs genuine on-chain community governance over a treasury. But its DeFi activity and developer count still trail Ethereum and Solana by a wide margin. So today it's a technically respected, well-governed network still searching for the real-world usage to match its ambitions.