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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? 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? What is the difference between multicast delegate invocation and exception handling? How do the built-in Func<>, Action<>, and Predicate<T> generic delegate types differ, and when would you use each?
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How do events differ from plain delegates?

Intermediate

Answer

An event is a delegate wrapped so external code can only subscribe (+=) or unsubscribe (-=), not invoke or overwrite it — enforcing the publisher/subscriber boundary.
public event EventHandler? Saved;
protected void OnSaved() => Saved?.Invoke(this, EventArgs.Empty);
Real-world example A ViewModel raises a Saved event that views subscribe to, without views being able to fire it.
All 17 Delegates, Events & Lambdas questions