1. Linguistics is the scientific study of human language, involving hypotheses about language that must be explicit, verifiable, and identify general laws of language. 2. Language has discrete elements like phonemes that combine to form words according to systematic rules, allowing for infinite sentences through recursion, unlike animal languages. 3. The study of linguistics examines both the abstract system of a language (langue) and how it is used in actual speech (parole), seeking to understand universal properties and differences between languages.