<ul><li>IEnumerable is best for in-memory data collections and performs operations in memory with deferred execution for client-side filtering.</li><li>IQueryable is ideal for querying data from a database, executing queries on the server with deferred execution and efficient data fetching.</li><li>Use IQueryable for database queries to optimize performance, minimize client-side operations, and avoid eager conversion to lists.</li><li>For in-memory collections, opt for IEnumerable to prevent unnecessary data loading and complexities of IQueryable usage.</li></ul>

Understanding the Key Differences Between IQueryable and IEnumerable

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