Lambda expressions are a feature in C# that provide a concise way to write inline code blocks. They are used to simplify delegate invocations, event handling, LINQ queries, and other scenarios where you need to pass a block of code as an argument to a method. Here is an example of using lambda expressions in C#: using System; using System.Collections.Generic; delegate int Calculate ( int x, int y ) ; class Program { static void Main ( string [] args ) { Calculate add = (x, y) => x + y; Calculate multiply = (x, y) => x * y; Console.WriteLine( add ( 3 , 4 )); Console.WriteLine(multiply( 3 , 4 )); } } In this example, we have defined a delegate ` Calculate ` which refers to methods that take two paramet...