LL(1) parsing is a top-down parsing technique used for context-free grammars that reads input from left to right and constructs a leftmost derivation with one symbol of lookahead. It requires the grammar to be free of ambiguity, left recursion, and properly left-factored. The parser uses First and Follow sets to construct a predictive parsing table, where each cell corresponds to a specific production based on the lookahead symbol. The "LL(1)" property ensures that for any non-terminal and input symbol, there is at most one valid parsing action, making it efficient and deterministic.
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