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What is the difference between IQueryable<T> and IEnumerable<T>?

I read so much about IQueryable and I still dont understand when to use what and what are IQueryableProvider’s methods used for.

My english isnt perfect so understanding that article is imposibol for me. http://blogs.msdn.com/b/mattwar/archive/2007/07/30/linq-building-an-iqueryable-provider-part-i.aspx

*Do not tell me to use IEnumerable for collections and IQueryable for sql becouse we can use each one to collections and sql.

Answer 1

An IEnumerable is near enough the simplest interface for a collection that can be iterated over, like in a foreach loop.

An IQueryable is a query builder that holds a LINQ query that can be added to until you do something with the query that forces it to execute and return a collection.