What is the difference between "USB-C to HDMI Adapter" and "MHL"?

When I search if Samsung Galaxy S8 supports MHL or not, I am getting crazy. 50% of online articles say S8 does not support MHL including [mhltech.org link](https://www.mhltech.org/devices.aspx?tid=1) and [technipages](https://www.technipages.com/connect-galaxy-s8-to-tv) Another 50% of online articles say S8 supports MHL. It obviously supports **USB-C to HDMI Adapter** which is only one side with Type-C port and another side with HDMI port cable. If S8 does NOT support **MHL**, what is the difference between "USB-C to HDMI Adapter" and "MHL"? Does "USB-C to HDMI Adapter" have worse video output than "MHL"? Thanks a lot.