The essential Western kitchen knife. The French profile has a flatter belly and a more pointed tip, which suits draw cuts, forward slicing, and tip work. The German profile has a pronounced belly curve optimized for the rocking chop and heavier use. German 8-inch chef's knives (such as the Wüsthof Classic and Zwilling Four Star) use the German profile; American and French-production chef's knives typically use the flatter French profile.
Primary tasks: mincing, dicing, slicing, and chopping vegetables; breaking down chicken joints; slicing boneless protein. This is the baseline, and if you own one knife it is this one: roughly 90% of kitchen tasks can be done with a well-maintained chef's knife.
Ideal steel: a forgiving mid-hardness stainless that hones well and resists chipping, such as X50CrMoV15, 14C28N, AEB-L, or VG-10 in quality production, or CPM MagnaCut and S35VN for the cook who also maintains their tools.
Limitations: fine precision work (the paring knife's job), bread slicing (the bread knife), filleting fish (the fillet knife), and hard-bone butchery.