Unglazed porcelain tiles are full-bodied—the entire tile is composed of natural clay. Commercial areas, like business offices and stores, are better with tough and dense unglazed tiles while projects within the home that focus more on color and theme will benefit from glazed porcelain.

https://www.tileclearancecentre.com/Glazed-or-Unglazed-Porce...

El porcelánico técnico o gres porcelánico todo masa corresponde a las baldosas de cerámica de gres porcelánica en las que la pieza completa está compuesta por el mismo material porcelánico.

La fabricación del porcelánico técnico se basa en presionar una masa de materias primas nobles, que posteriormente se cuece a altas temperaturas. Al ser un mismo material en toda la baldosa, el porcelánico técnico posee el mismo color tanto en la base como en la superficie.

Antiguamente las piezas de porcelánico técnico eran monocolor, pero debido a los avances tecnológicos en el sector, actualmente podemos encontrar baldosas con acabados que imitan a otros materiales como mármol, piedras, etc.

https://discesur.es/que-es-el-porcelanico-tecnico/

Porcelain tile: Is actually part of the ceramic family, but distinct in its characteristics due to the types and mix of clays used, and the specific methods of production. Porcelain is a much stronger version of ceramic. Both types are made of clay and are fired in a kiln. The main differences are that porcelain tiles have a water absorption rate of less than 0.5%, a result which classifies them as fully vitrified, making them incredibly hard and rendering them suitable for heavy traffic floor use, including industrial situations. Porcelain tiles can be used in virtually any situation - from light traffic bathroom floors (and walls) to factory floors and swimming pools, both in (as mosaics) and around them.

Unglazed Porcelain:

Full-bodied porcelain is a type of vitrified tile where the colour runs right through the body with a single colour from the surface to the base of the tile. Not only is the colour consistent throughout, but the technical properties, such as water absorption, frost & acid resistance are also consistent.

https://www.oldeenglishtiles.com.au/blogs/news/the-differenc...

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Note added at 2 days 26 mins (2021-12-31 18:00:09 GMT) Post-grading
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Mary, I'm glad you found it helpful. Thank you for the points. I also wish you all the best for the new year.