Discrete Time Fourier Transform (DTFT) explained visually

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References:
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https://amzn.to/3F62I1T
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00:00 Recall from the previous video
00:43 Discrete time signal
1:17 Discrete time Fourier Transform (DTFT)
2:40 periodicity in the frequency domain
4:05 Effect of sample time on periodicity of the frequency domain
5:02 Discrete Frequency Domain Signal
5:21 Discrete signal in the frequency domain is periodic in time domain
6:31 Effect of sample frequency on periodicity of the time domain
7:13 why there's no imaginary part
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The previous video in this playlist:    • Continuous Time Fourier Transform exp...