German 'Salz' and English 'salt' are cognates so transparent that they scarcely need etymology to reveal their kinship. Both descend from Proto-Germanic *saltą, which derives from PIE *seh₂l- (salt) with a *-t- suffix. The PIE root is among the most ancient and stable in comparative linguistics, attested across nearly every branch of the Indo-European family with virtually no semantic drift — salt has meant salt for at least six millennia.
The consonant correspondence between 'Salz' and 'salt' provides a clean illustration of the High German Consonant Shift. Proto-Germanic *t, preserved in English 'salt,' Dutch 'zout,' and Old Norse 'salt,' shifted to the affricate /ts/ (spelled 'z') in Old High German 'salz.' This is the same shift visible in the pairs English 'ten' / German 'zehn,' English 'tongue' / German 'Zunge,' English 'sit' / German 'sitzen,' and English 'heart' / German 'Herz.' The shift affected *t in word-final position and after vowels, producing
The PIE root *seh₂l- produced an extraordinarily influential family of words through Latin 'sāl' (salt). 'Salary' derives from Latin 'salārium,' traditionally explained as the salt allowance given to Roman soldiers — whether this literally means 'salt money' or more broadly 'provisions money' is debated, but the connection to salt is undeniable. 'Salad' comes from Vulgar Latin *salāta (salted), because the Romans dressed their vegetables with salt. 'Sauce' comes from Latin 'salsa' (salted), as does 'salsa' directly. 'Sausage' comes from Late Latin 'salsīcia' (something prepared with salt — i.e., salted preserved meat
The Greek cognate 'háls' (salt, also 'the sea') contributed 'halogen' (salt-maker — because halogens react with metals to form salts), 'halite' (rock salt), and 'halophyte' (a salt-tolerant plant). Through Greek, the humble salt crystal left its mark on chemistry, geology, and botany.
The geographic impact of the salt-word is equally striking. Salzburg (salt fortress), Salzgitter (salt behind the fence), Salzkammergut (salt-chamber estate), and Hallstatt (salt settlement, from Celtic *hal-, salt — itself from the same PIE root) are all named for their salt deposits or salt trade. The Hallstatt culture (c. 800–450 BCE), one of the defining archaeological cultures of Iron Age Europe, was named for the Austrian village whose ancient salt mines preserved artifacts in extraordinary condition. The Celtic *hal- (salt) that appears in 'Hallstatt' and 'Hallein' is cognate with both Germanic 'Salz/salt' and Greek 'háls,' all from PIE *seh₂l-.
Salt's importance to human civilization can scarcely be overstated. Before refrigeration, salt was the primary means of preserving meat and fish, making it as strategically vital as oil is today. Salt roads (German 'Salzstraßen') crisscrossed medieval Europe, and the salt trade built fortunes and cities. The word 'Salz' in German place names and surnames (Salzmann, Salzer) testifies to this economic centrality.
In modern German, 'Salz' appears in everyday compounds: 'Salzwasser' (salt water), 'Salzstreuer' (salt shaker), 'Salzsäure' (hydrochloric acid, literally 'salt acid'), 'Salzbergwerk' (salt mine), and the idiom 'das Salz in der Suppe' (the salt in the soup — meaning the essential ingredient that makes something worthwhile). English parallels include 'saltwater,' 'saltshaker,' 'saltmine,' and the idiom 'worth one's salt' — which loops back to the Latin 'salārium' and the ancient equation of salt with honest payment for honest work.