Binary Zero, NULL Byte and ASCII [closed]

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I am very confused. Is there any relationship between the following:

1. Binary Zero.
2. Null Byte.
3. ASCII Character 0 (Decimal value is 48).

Your explanation is highly appreciated.

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Technically, I suppose the first refers to a single bit. Eight bits make a byte, and eight binary zeros would thus comprise a "null byte", the byte with numeric value 0 which is used to terminate C strings. The ASCII value used to represent the text character 0 is, as you say, 48, and there is nothing special about that value -- it's just the more or less random number that was assigned to this duty.