different between atsc vs hdtv

atsc

atsc From the web:

• what is atsc 3.0
• what is atsc tv
• what is atsc tuner
• what is atsc 3.0 tuner
• what is atsc 3.0 next gen tv
• what is atsc 3.0 tv
• what is atsc signal
• what does atsc 3.0 stand for

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hdtv

hdtv From the web:

• what hdtv antenna do i need
• what hdtv channels are in my area
• what hdtv channels can i get
• what hdtv means
• what hdtv antenna is best
• what hdtv is best
• what hdtv settings
• hdtv what does it mean