There are two types of Tidal subscriptions, Tidal Premium for $9.99/month (US), and Tidal HiFi for $19.99/month.
With a Tidal Premium subscription you get a lossy compressed stream, either 96kpbs AAC or 320kbps AAC depending on whether you select normal or high quality in the player.
With a Tidal HiFi subscription, you can also get a CD-quality stream (16bits/44.1kHz) that is losslessly compressed with FLAC. Nearly all players support this format, you just have to select it in the player. The only playback option that doesn't handle the CD-quality FLAC stream is if you're using the web player with a browser other than Chrome.
If you have a Tidal HiFi subscription, you can also access Tidal "Masters". Tidal Masters are MQA files, mostly from Warner music. These are sourced from higher-than-CD resolution files (24/48, 24/88.2, 24/96, etc.) and they are lossily compressed into a 24/44.1 FLAC container using MQA encoding. If you're streaming Tidal Masters via the Windows or MacOSX application, the application will decode the MQA stream into its original format (24/48, 24/88.2, 24/96, etc.) for playback using non-MQA hardware. If you have a DAC that supports MQA, you can have the application pass the MQA stream through to the DAC for decoding.
For now, these are the only ways to decode Tidal Masters. Streaming music players which support Tidal such as those from Auralic, Naim, Linn, Lumin, Simaudio, etc. aren't capable of playing Tidal Masters.
Hope that clears it up.
HT: Dynaudio C2, Contour S CX, 2x BM14S, Aperion surrounds, Simaudio Titan, Marantz AV8801, Oppo 103, Linn Majik DS, and a Pioneer Kuro
Stereo: Dynaudio Focus 160, Simaudio W-5 LE or Luxman M-600A, Linn Akurate DSM, 2x Rythmik F12G
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