Lambda? You keep using that letter

Lambdas. All the cool kid languages have them. But does lambda mean what C++ and other languages, from Java to Python, mean by lambda? Where did lambdas come from? What were they originally for? What is their relationship to data abstraction?

In this session, we will into the history, the syntax, the uses and abuses of lambdas, and how lambda constructs in C++ and other languages do (or do not) match the original construct introduced in lambda calculus.