Focus Keyword: IQueryable vs IEnumerable in LINQ

IQueryable vs IEnumerable in LINQ:
The main difference between IQueryable and IEnumerable in LINQ is that IQueryable is an interface that allows for building queries that can be executed remotely on a database server, while IEnumerable is used for querying data from in-memory collections like lists or arrays.

Key Features:
- IQueryable implements the IQueryable interface and enables deferred execution of queries.
- IEnumerable provides a way to iterate over a collection but does not support querying capabilities like filtering, sorting, or aggregation.

Use Cases:
- Use IQueryable when querying data from a remote data source like a database, as it allows for building optimized SQL queries.
- Use IEnumerable when working with in-memory data collections or when simple iteration over a collection is needed.

Understanding the difference between IQueryable and IEnumerable in LINQ is essential for optimizing query performance and efficiently handling data retrieval operations.