A rollup is a Layer 2 scaling approach that processes transactions off the base layer and posts data or proofs back to a Layer 1.
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Short definition
Rollup is a rollup is a Layer 2 scaling approach that processes transactions off the base layer and posts data or proofs back to a Layer 1.
Simple explanation
Rollups bundle many transactions together to reduce cost and improve scalability.
Why it matters
Rollups are important in Ethereum scaling and affect bridges, transaction finality, and network design.
Example context
Optimistic rollups and zero-knowledge rollups are two broad rollup types.