Scaling in crypto refers to Increasing the capacity of a blockchain to handle more transactions.
In the context of blockchain technology, scaling refers to increasing the capacity of a blockchain network to handle more transactions. Blockchains face a fundamental scalability problem because each transaction needs to be processed by most nodes in the network. This limits the number of transactions that can be processed per second and makes transaction fees high when the network is congested. Solutions to blockchain scalability issue include increasing the block size, sharding the blockchain, or creating off-chain transactions.
Ethereum's transition to Ethereum 2.0 is aimed at scaling the network by introducing sharding and changing the consensus mechanism to Proof of Stake.