The Nikon Z DX 24mm f/1.7 is Nikon’s first DX (APS-C format) prime lens specifically for cameras like the Z 30, Z 50 and Z fc. Thanks to the 1.5x crop factor of Nikon (and most other) APS-C format cameras, it gives a pretty much identical field of view to 35mm lenses that full-frame photographers typically favour for street photography. Indeed, the compact build helps candid shooting on the streets, so you can be discreet and avoid drawing attention to yourself.
Naturally, you can also use FX (full-frame compatible) lenses on DX format Z-system