Difference between DVB-T and TNT

DVB-T stands for "Digital Video Broadcasting – Terrestrial". It is the part of the DVB standard applied to terrestrial radio transmissions. In France and Switzerland, this system is used for digital terrestrial television (TNT). This standard defines the method of transmitting television services (audio, video, and data), using OFDM modulation with a concatenation of channel coding (COFDM).

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Note that there is no difference between DVB-T and TNT since they are the same thing.

However, there is a difference between the DVB-T standard (T = terrestrial) and the DVB-S standard (S = satellite), all of which fall under the framework of terrestrial broadcasting, without physical support, via airwaves. Cable and ADSL are not terrestrial, according to the ITU's definition, but there is increasing talk of
the terrestrial distribution (wired)

The DVB-S and T standards are "invariable" you cannot receive TNT with a DVB-S terminal, in less technical terms, no TNT via satellite dish.

Do not take the presentations made by general media that do not technically master the subject literally.

and recently the DVB-T2 (which has nothing to do with DVB-S2):

https://forums.commentcamarche.net/forum/affich-20543915-norme-tnt-arrivee-dvb-t2-fin-mpeg-2