Most famously used in Czech pilsner. The most famous of all aroma hops, Saaz is fresh and cleansing. It is very mild with pleasant hoppy notes. It is essential for pilseners and also used in Belgian ales. Polish Lublin is similar, but nothing can really substitute for Saaz.
Typical use
Aroma, Bittering
Possible substitutes
Polnischer Lublin (Lublin, Lubelsk)