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What is a delegate in C#? What is a delegate in C#, and what does it represent conceptually? How do you write and use a lambda expression as a shorthand for a delegate? What is a delegate in C#, and how does it enable passing methods as values? What is a closure and what is a common pitfall? How do events differ from plain delegates? What is an event, and how does it differ from a plain public delegate field? What are multicast delegates, and in what order do their subscribed methods get invoked? How does variable capture (closures) work in a C# lambda expression, and what pitfall occurs when capturing a loop variable? What causes event-handler memory leaks and how do you prevent them?
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What is the difference between Func, Action and Predicate?

Beginner

Answer

Func<...,TResult> returns a value; Action<...> returns void; Predicate<T> is a Func<T,bool> used for tests.
Func<int,bool> isEven = n => n%2==0;
Action greet = () => Console.Write("hi");
Real-world example Passing isEven to List.FindAll to filter numbers.
All 17 Delegates, Events & Lambdas questions