Glossary
Sealevel
Solana's parallel-execution runtime — schedules non-conflicting transactions to run in parallel across CPU cores by reading their explicit account-access lists.
Sealevel is Solana's parallel transaction-execution engine. Each Solana transaction must declare upfront which accounts it reads and which it writes. Sealevel uses those access lists to find non-conflicting transactions and execute them in parallel across CPU cores.
The model is one of the core reasons Solana achieves its peak throughput: where Ethereum executes one transaction at a time, Solana validators can process dozens or hundreds simultaneously, limited mainly by the read/write conflict graph and CPU count. Sealevel is now a generic technique other SVM chains inherit.