Linked from
The 6 pages that link to Wine acidity, each with the reason it gives.
Malic acidRelated: Malic acid contributes sharp, green-fruit notes to many wines.
WinemakingRelated: Acidity affects freshness, microbial stability, and the balance of finished wine.
Red wineRelated: Acidity balances red wine’s fruit, alcohol, and tannin.
OenologyRelated: Acidity affects freshness, microbial resistance, and the course of fermentation.