The Ethereum Wallet stores the blockchain locally on your computer. The files are stored in the following directory:
Mac: ~/Library/Ethereum
The blockchain is constantly growing as new blocks are added to the chain. Each block contains a record of all the transactions that have occurred since the last block was added.
The Ethereum Wallet will automatically download and sync the blockchain. This may take a while depending on your connection speed and the size of the blockchain.
Other related questions:
Q: Where is Ethereum blockchain data stored?
A: Ethereum blockchain data is stored on every node in the network.
Q: Where is the Ethereum wallet address?
A: There is no specific Ethereum wallet address. Rather, each Ethereum account has its own address.
Q: Which storage library does Ethereum use?
A: Ethereum uses a variety of storage libraries, including LevelDB, RocksDB, and Hyperledger Fabric.