What is the sigma 45mm f 2 8 dg contemporary good for?

Here is what the site says about that.

From Sigma 45mm f/2.8 DG Contemporary: Sigma 45mm f/2.8 DG Contemporary: A prime lens by Sigma for Full frame cameras, 45mm f/2.8. A small metal standard prime with a soft, classic look wide open; sold as the 45mm f/2.8 DG DN before 2025. Specs - Maker: Sigma - Focal length: 45mm (prime) - Maximum aperture: f/2.8 - Made for: Full frame sensors - Mounts: Sony E, L-Mount - Stabilised: no - Autofocus: yes What it frames like - On full frame ...

From Sigma 90mm f/2.8 DG Contemporary: Sigma 90mm f/2.8 DG Contemporary: A prime lens by Sigma for Full frame cameras, 90mm f/2.8.

Quoted from this site's pages.