Italy has 31 recognized regional languages/dialects — many classified by UNESCO as separate languages, not accents of Italian. A Neapolitan speaker and a Venetian speaker using their native dialects cannot understand each other. Standard Italian (based on 14th-century Tuscan/Florentine) was imposed as the national language only after unification (1861) — and even then, most Italians didn't speak it daily until television arrived in the 1950s. Dialects are not dying. They're identity.
The major groups: Gallo-Italic (north): Piemontese, Lombardo, Emiliano, Ligure. Venetian (northeast): Its own group — Venice, Verona, Padova each have distinct variants. Tuscan (center): The basis of standard Italian — Florentines essentially speak "Italian" because Italian IS Florentine. Central (Rome, Umbria, Marche): Romanesco (Roman dialect) is distinctive but closer to standard Italian. Southern: Napoletano (a LANGUAGE — with its own grammar, literature, song tradition), Calabrese, Pugliese. Siciliano: Classified as a separate language by some linguists — Arabic, Greek, Norman, and Spanish layers. Sardinian: The most distinct — classified as a separate Romance language, closest to Latin of any surviving language. For travelers: Everyone speaks standard Italian. But listen for dialect in markets, between families, in small-town bars. When an Italian switches to dialect, they're switching identities — from "national" to "local," from "formal" to "home."