A playful and contemporary name which could be well suited to a company in the advertising, retail or consumer goods sectors.
The name "JestZ" has only five characters and only one syllable. One-syllable names are very rare and exceptionally sought after. One syllable names are used by established brands like Dell, Ford and Square.
Jestz.com is a dot-com domain. Dot com domains are the most sought after top-level-domain in the world, famously used by websites like youtube.com. Once secured, a dot-com all but guarantees no-one else can outrank you for your own name in the long run.