Maximum value of the analogWrite() function

Why is the maximum possible value of the analogWrite() function 255 starting from 0?

@A.K.N
Because our module can write upto 256 bits(0 to 255) i.e 2^8

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But how come the light monitoring system can show data values from 0 upto 1023(1.02thousand) ,i.e., 2^10?

In arduino, ADC(analogRead) is 10bit and PWM timer (analogWrite) is 8 bit. may be this device also come with 10 bit ADC and 8 bit PWM timer. so when we convert 10 bit it become 0-1023. Please someone clarify

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@karthikcakuttu your reason seems pluasible but clarification is needed

@A.K.N For your clarification…ADC can support upto 10 bits while PWM can support upto 14 bits

I think the data in the photos are for the ESP8266EX model, but the model we got is ESP8266 only

@A.K.N
analogWrite() function is for A0 pin which is a 8 bit pin and total range can be found using the formula
2^8 =256 (it can take 256 values)and since we start from 0 so last value will be 255.