1. Anonymous types is used to create new type without defining a type first
2. It is used in LINQ, Returns a few of read only properties while querying collection of object using LINQ
3. Use new keyword to define anonymous type
4. It is reference type, derived from system.object
5. If more than one anonymous types have same properties, and same order in same assembly then they consider us same type by the compiler.

Example:

Define anonymous type using new keword
var Offer= new {offerid=100, Offername="50% discount on all famous brands"}

returns set of few read only properties

var OfferQuery = 
    from Offer in Offers
    select new 
    { 
    Offer.OfferName,
    Offer.discount
    };

foreach (var Offerinfo in OfferQuery)
{
    Console.WriteLine("OfferName={0}, Discount={1}", Offerinfo.OfferName, Offerinfo.discount);
}