Difference between IEnumerable and IQueryable in C#?

In C#, IEnumerable and IQueryable are both interfaces that represent a sequence of elements that can be enumerated or iterated over. However, there are some key differences between the two interfaces:

Definition: IEnumerable is a base interface that represents a non-generic collection of elements that can be enumerated using a foreach loop or the GetEnumerator() method. IQueryable is a more specific interface that extends IEnumerable and represents a collection of elements that can be queried using a query language, such as LINQ.
Deferred execution: IEnumerable uses deferred execution, which means that the query is executed when the sequence is enumerated. This can lead to multiple enumerations of the same sequence, which can impact performance. IQueryable, on the other hand, uses deferred execution with query optimization, which means that the query is executed when the sequence is enumerated, but the query is optimized before execution to minimize the number of database requests or other operations.
Query execution: IEnumerable executes the query on the client side, which means that all data is loaded into memory before the query is executed. IQueryable, on the other hand, executes the query on the server side, which means that only the requested data is loaded into memory.
Type of data source: IEnumerable is typically used with in-memory collections, such as lists or arrays. IQueryable, on the other hand, is typically used with remote data sources, such as databases or web services.

In summary, IEnumerable and IQueryable are both interfaces that represent a sequence of elements, but they differ in their definition, deferred execution, query execution, and type of data source. IEnumerable is a base interface that represents a non-generic collection of elements that can be enumerated, while IQueryable extends IEnumerable and represents a collection of elements that can be queried using a query language. IEnumerable uses deferred execution, while IQueryable uses deferred execution with query optimization. IEnumerable executes the query on the client side, while IQueryable executes the query on the server side. IEnumerable is typically used with in-memory collections, while IQueryable is typically used with remote data sources.

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