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Summary Using storage instead of memory for structs and arrays can save gas in certain scenarios. Let's discuss how and when this gas optimization can be beneficial.

When you declare a struct or an array in Solidity, you have the option to define it in either storage or memory. Here are the key differences:

1-Storage: When a struct or an array is declared in storage, its data is stored permanently on the blockchain. It is assigned a storage slot and can persist across multiple function calls and transactions.

2-Memory: When a struct or an array is declared in memory, its data is temporary and exists only during the execution of a function. It is not stored on the blockchain and is discarded after the function call completes.