DirectX is more than just Vulkan. It does sound, input, etc...
Vulkan is like Direct3D 12, a low level 3D API. Between the two, most seem to consider Vulkan the better option. However, Vulkan has the reputation of being verbose and very much not noob friendly. It is mostly geared towards advanced engine developers who want full control to make the most of the hardware.
Besides 3D, the rest of the multimedia API are a bit of a mess it seems. On Windows and elsewhere. I haven't look at it for many years though.
Vulkan is like Direct3D 12, a low level 3D API. Between the two, most seem to consider Vulkan the better option. However, Vulkan has the reputation of being verbose and very much not noob friendly. It is mostly geared towards advanced engine developers who want full control to make the most of the hardware.
Besides 3D, the rest of the multimedia API are a bit of a mess it seems. On Windows and elsewhere. I haven't look at it for many years though.