A function without a name that is defined inline and typically used for short, one-time operations. These functions are often passed as arguments to other functions or used in functional programming constructs.
'Anonymous' comes from Greek 'anonymos' meaning 'without a name'. In programming, the concept emerged with lambda calculus in the 1930s and became prominent in languages like LISP in the 1950s, representing functions that don't need formal naming.
Anonymous functions are like unnamed workers in a factory assembly line - they do their specific job perfectly when needed, but don't need name tags because they're only used once in that exact spot. It's programming's way of avoiding the 'what should I name this?' problem!
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